Chemistry (CY) 2012 GATE Paper without solution | GATE Chemistry Mock Test Series PDF Download

 Page 1


2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 1/20 
CY: CHEMISTRY 
 
Duration: Three Hours           Maximum Marks: 100 
Read the following instructions carefully. 
 
1. Do not open the seal of the Question Booklet until you are asked to do so by the invigilator. 
 
2. Take out the Optical Response Sheet (ORS) from this Question Booklet without breaking the seal 
and read the instructions printed on the ORS carefully.  
 
3. On the right half of the ORS, using ONLY a black ink ball point pen, (i) darken the bubble 
corresponding to your test paper code and the appropriate bubble under each digit of your registration 
number and (ii) write your registration number, your name and name of the examination centre and 
put your signature at the specified location. 
 
4. This Question Booklet contains 20 pages including blank pages for rough work. After you are 
permitted to open the seal, please check all pages and report discrepancies, if any, to the invigilator. 
 
5. There are a total of 65 questions carrying 100 marks. All these questions are of objective type. Each 
question has only one correct answer. Questions must be answered on the left hand side of the ORS 
by darkening the appropriate bubble (marked A, B, C, D) using ONLY a black ink ball point pen 
against the question number. For each question darken the bubble of the correct answer. More 
than one answer bubbled against a question will be treated as an incorrect response. 
 
6. Since bubbles darkened by the black ink ball point pen cannot be erased, candidates should darken 
the bubbles in the ORS very carefully. 
 
7. Questions Q.1 – Q.25 carry 1 mark each. Questions Q.26 – Q.55 carry 2 marks each. The 2 marks 
questions include two pairs of common data questions and two pairs of linked answer questions. The 
answer to the second question of the linked answer questions depends on the answer to the first 
question of the pair. If the first question in the linked pair is wrongly answered or is unattempted, then 
the answer to the second question in the pair will not be evaluated. 
 
8. Questions Q.56 – Q.65 belong to General Aptitude (GA) section and carry a total of 15 marks. 
Questions Q.56 – Q.60 carry 1 mark each, and questions Q.61 – Q.65 carry 2 marks each.   
 
9. Unattempted questions will result in zero mark and wrong answers will result in NEGATIVE marks.  
For all 1 mark questions, ? mark will be deducted for each wrong answer. For all 2 marks questions, 
? mark will be deducted for each wrong answer.  However, in the case of the linked answer question 
pair, there will be negative marks only for wrong answer to the first question and no negative marks 
for wrong answer to the second question.  
 
10. Calculator is allowed whereas charts, graph sheets or tables are NOT allowed in the examination hall. 
 
11. Rough work can be done on the question paper itself. Blank pages are provided at the end of the 
question paper for rough work. 
 
12. Before the start of the examination, write your name and registration number in the space provided 
below using a black ink ball point pen. 
 
Name 
 
 
Registration Number 
CY 
      
 
 
 
Page 2


2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 1/20 
CY: CHEMISTRY 
 
Duration: Three Hours           Maximum Marks: 100 
Read the following instructions carefully. 
 
1. Do not open the seal of the Question Booklet until you are asked to do so by the invigilator. 
 
2. Take out the Optical Response Sheet (ORS) from this Question Booklet without breaking the seal 
and read the instructions printed on the ORS carefully.  
 
3. On the right half of the ORS, using ONLY a black ink ball point pen, (i) darken the bubble 
corresponding to your test paper code and the appropriate bubble under each digit of your registration 
number and (ii) write your registration number, your name and name of the examination centre and 
put your signature at the specified location. 
 
4. This Question Booklet contains 20 pages including blank pages for rough work. After you are 
permitted to open the seal, please check all pages and report discrepancies, if any, to the invigilator. 
 
5. There are a total of 65 questions carrying 100 marks. All these questions are of objective type. Each 
question has only one correct answer. Questions must be answered on the left hand side of the ORS 
by darkening the appropriate bubble (marked A, B, C, D) using ONLY a black ink ball point pen 
against the question number. For each question darken the bubble of the correct answer. More 
than one answer bubbled against a question will be treated as an incorrect response. 
 
6. Since bubbles darkened by the black ink ball point pen cannot be erased, candidates should darken 
the bubbles in the ORS very carefully. 
 
7. Questions Q.1 – Q.25 carry 1 mark each. Questions Q.26 – Q.55 carry 2 marks each. The 2 marks 
questions include two pairs of common data questions and two pairs of linked answer questions. The 
answer to the second question of the linked answer questions depends on the answer to the first 
question of the pair. If the first question in the linked pair is wrongly answered or is unattempted, then 
the answer to the second question in the pair will not be evaluated. 
 
8. Questions Q.56 – Q.65 belong to General Aptitude (GA) section and carry a total of 15 marks. 
Questions Q.56 – Q.60 carry 1 mark each, and questions Q.61 – Q.65 carry 2 marks each.   
 
9. Unattempted questions will result in zero mark and wrong answers will result in NEGATIVE marks.  
For all 1 mark questions, ? mark will be deducted for each wrong answer. For all 2 marks questions, 
? mark will be deducted for each wrong answer.  However, in the case of the linked answer question 
pair, there will be negative marks only for wrong answer to the first question and no negative marks 
for wrong answer to the second question.  
 
10. Calculator is allowed whereas charts, graph sheets or tables are NOT allowed in the examination hall. 
 
11. Rough work can be done on the question paper itself. Blank pages are provided at the end of the 
question paper for rough work. 
 
12. Before the start of the examination, write your name and registration number in the space provided 
below using a black ink ball point pen. 
 
Name 
 
 
Registration Number 
CY 
      
 
 
 
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 2/20 
Some Useful Data 
 
1. At T = 298 K, 2.303 0.0591
RT
F
? 
 
2. Atomic Numbers  
 
H     1 
B     5 
C     6 
N     7 
O     8 
P     15 
Ca   20 
Cr   24 
Mn  25 
Fe   26 
Co   27 
Ni   28 
Zn   30 
Ru   44 
    
 
3. Atomic weights (to the nearest integer) 
 
H      1 
C    12 
N    14 
O    16 
Ca   40 
 
Page 3


2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 1/20 
CY: CHEMISTRY 
 
Duration: Three Hours           Maximum Marks: 100 
Read the following instructions carefully. 
 
1. Do not open the seal of the Question Booklet until you are asked to do so by the invigilator. 
 
2. Take out the Optical Response Sheet (ORS) from this Question Booklet without breaking the seal 
and read the instructions printed on the ORS carefully.  
 
3. On the right half of the ORS, using ONLY a black ink ball point pen, (i) darken the bubble 
corresponding to your test paper code and the appropriate bubble under each digit of your registration 
number and (ii) write your registration number, your name and name of the examination centre and 
put your signature at the specified location. 
 
4. This Question Booklet contains 20 pages including blank pages for rough work. After you are 
permitted to open the seal, please check all pages and report discrepancies, if any, to the invigilator. 
 
5. There are a total of 65 questions carrying 100 marks. All these questions are of objective type. Each 
question has only one correct answer. Questions must be answered on the left hand side of the ORS 
by darkening the appropriate bubble (marked A, B, C, D) using ONLY a black ink ball point pen 
against the question number. For each question darken the bubble of the correct answer. More 
than one answer bubbled against a question will be treated as an incorrect response. 
 
6. Since bubbles darkened by the black ink ball point pen cannot be erased, candidates should darken 
the bubbles in the ORS very carefully. 
 
7. Questions Q.1 – Q.25 carry 1 mark each. Questions Q.26 – Q.55 carry 2 marks each. The 2 marks 
questions include two pairs of common data questions and two pairs of linked answer questions. The 
answer to the second question of the linked answer questions depends on the answer to the first 
question of the pair. If the first question in the linked pair is wrongly answered or is unattempted, then 
the answer to the second question in the pair will not be evaluated. 
 
8. Questions Q.56 – Q.65 belong to General Aptitude (GA) section and carry a total of 15 marks. 
Questions Q.56 – Q.60 carry 1 mark each, and questions Q.61 – Q.65 carry 2 marks each.   
 
9. Unattempted questions will result in zero mark and wrong answers will result in NEGATIVE marks.  
For all 1 mark questions, ? mark will be deducted for each wrong answer. For all 2 marks questions, 
? mark will be deducted for each wrong answer.  However, in the case of the linked answer question 
pair, there will be negative marks only for wrong answer to the first question and no negative marks 
for wrong answer to the second question.  
 
10. Calculator is allowed whereas charts, graph sheets or tables are NOT allowed in the examination hall. 
 
11. Rough work can be done on the question paper itself. Blank pages are provided at the end of the 
question paper for rough work. 
 
12. Before the start of the examination, write your name and registration number in the space provided 
below using a black ink ball point pen. 
 
Name 
 
 
Registration Number 
CY 
      
 
 
 
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 2/20 
Some Useful Data 
 
1. At T = 298 K, 2.303 0.0591
RT
F
? 
 
2. Atomic Numbers  
 
H     1 
B     5 
C     6 
N     7 
O     8 
P     15 
Ca   20 
Cr   24 
Mn  25 
Fe   26 
Co   27 
Ni   28 
Zn   30 
Ru   44 
    
 
3. Atomic weights (to the nearest integer) 
 
H      1 
C    12 
N    14 
O    16 
Ca   40 
 
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 3/20 
Q. 1 – Q. 25 carry one mark each 
 
Q.1  In the proton decoupled 
13
C NMR spectrum of  7-norbornanone, the number of signals obtained is  
 
(A)  7 (B)  3 (C)  4 (D)  5 
 
Q.2  Identify the most probable product in the given reaction 
 
 
 
(A)    
                  
(B)  
                          
(C) 
                  
(D) 
                         
 
Q.3  In the cyclization reaction given below, the most probable product formed is 
  
 
 
(A)
 
  
(B)   (C)
  
  (D)    
 
Q.4  If ?y and ?p
y
 are the uncertainties in the y-coordinate and the y component of the momentum of a 
particle respectively, then, according to uncertainty principle ?y?p
y
 is (
2
h
?
? and h is Planck’s 
constant) 
(A)  ? 
(B)  > 2 
(C)  > 
(D)  2 ? 
 
Q.5  The average length of a typical a-helix comprised of 10 amino acids is 
(A)  10 Å (B)  15 Å (C)  36 Å (D)  54 Å 
 
Q.6  Number of thymine residues in a 5000 kb DNA containing 23% guanine residues is 
(A)  2.70 × 10
6
 (B)  2.70 × 10
7
 (C)  1.35 × 10
6
 (D)  1.35 × 10
7
 
 
Page 4


2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 1/20 
CY: CHEMISTRY 
 
Duration: Three Hours           Maximum Marks: 100 
Read the following instructions carefully. 
 
1. Do not open the seal of the Question Booklet until you are asked to do so by the invigilator. 
 
2. Take out the Optical Response Sheet (ORS) from this Question Booklet without breaking the seal 
and read the instructions printed on the ORS carefully.  
 
3. On the right half of the ORS, using ONLY a black ink ball point pen, (i) darken the bubble 
corresponding to your test paper code and the appropriate bubble under each digit of your registration 
number and (ii) write your registration number, your name and name of the examination centre and 
put your signature at the specified location. 
 
4. This Question Booklet contains 20 pages including blank pages for rough work. After you are 
permitted to open the seal, please check all pages and report discrepancies, if any, to the invigilator. 
 
5. There are a total of 65 questions carrying 100 marks. All these questions are of objective type. Each 
question has only one correct answer. Questions must be answered on the left hand side of the ORS 
by darkening the appropriate bubble (marked A, B, C, D) using ONLY a black ink ball point pen 
against the question number. For each question darken the bubble of the correct answer. More 
than one answer bubbled against a question will be treated as an incorrect response. 
 
6. Since bubbles darkened by the black ink ball point pen cannot be erased, candidates should darken 
the bubbles in the ORS very carefully. 
 
7. Questions Q.1 – Q.25 carry 1 mark each. Questions Q.26 – Q.55 carry 2 marks each. The 2 marks 
questions include two pairs of common data questions and two pairs of linked answer questions. The 
answer to the second question of the linked answer questions depends on the answer to the first 
question of the pair. If the first question in the linked pair is wrongly answered or is unattempted, then 
the answer to the second question in the pair will not be evaluated. 
 
8. Questions Q.56 – Q.65 belong to General Aptitude (GA) section and carry a total of 15 marks. 
Questions Q.56 – Q.60 carry 1 mark each, and questions Q.61 – Q.65 carry 2 marks each.   
 
9. Unattempted questions will result in zero mark and wrong answers will result in NEGATIVE marks.  
For all 1 mark questions, ? mark will be deducted for each wrong answer. For all 2 marks questions, 
? mark will be deducted for each wrong answer.  However, in the case of the linked answer question 
pair, there will be negative marks only for wrong answer to the first question and no negative marks 
for wrong answer to the second question.  
 
10. Calculator is allowed whereas charts, graph sheets or tables are NOT allowed in the examination hall. 
 
11. Rough work can be done on the question paper itself. Blank pages are provided at the end of the 
question paper for rough work. 
 
12. Before the start of the examination, write your name and registration number in the space provided 
below using a black ink ball point pen. 
 
Name 
 
 
Registration Number 
CY 
      
 
 
 
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 2/20 
Some Useful Data 
 
1. At T = 298 K, 2.303 0.0591
RT
F
? 
 
2. Atomic Numbers  
 
H     1 
B     5 
C     6 
N     7 
O     8 
P     15 
Ca   20 
Cr   24 
Mn  25 
Fe   26 
Co   27 
Ni   28 
Zn   30 
Ru   44 
    
 
3. Atomic weights (to the nearest integer) 
 
H      1 
C    12 
N    14 
O    16 
Ca   40 
 
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 3/20 
Q. 1 – Q. 25 carry one mark each 
 
Q.1  In the proton decoupled 
13
C NMR spectrum of  7-norbornanone, the number of signals obtained is  
 
(A)  7 (B)  3 (C)  4 (D)  5 
 
Q.2  Identify the most probable product in the given reaction 
 
 
 
(A)    
                  
(B)  
                          
(C) 
                  
(D) 
                         
 
Q.3  In the cyclization reaction given below, the most probable product formed is 
  
 
 
(A)
 
  
(B)   (C)
  
  (D)    
 
Q.4  If ?y and ?p
y
 are the uncertainties in the y-coordinate and the y component of the momentum of a 
particle respectively, then, according to uncertainty principle ?y?p
y
 is (
2
h
?
? and h is Planck’s 
constant) 
(A)  ? 
(B)  > 2 
(C)  > 
(D)  2 ? 
 
Q.5  The average length of a typical a-helix comprised of 10 amino acids is 
(A)  10 Å (B)  15 Å (C)  36 Å (D)  54 Å 
 
Q.6  Number of thymine residues in a 5000 kb DNA containing 23% guanine residues is 
(A)  2.70 × 10
6
 (B)  2.70 × 10
7
 (C)  1.35 × 10
6
 (D)  1.35 × 10
7
 
 
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 4/20 
Q.7  Shown below is a Hammett plot obtained for the reaction  
 
 
 
 
 
 
 
The change in slope of the plot indicates that   
 
(A)  the reaction does not follow linear free energy relationship 
(B)  electrons are being withdrawn from the transition state in the mechanism 
(C)  electrons are being donated to the transition state in the mechanism 
(D)  the mechanism of the reaction is changing 
 
 
Q.8  The ratio of relative intensities of the two molecular ion peaks of methyl bromide (CH
3
Br) in the 
mass spectrum is 
 
(A)  M
+ 
: (M+2)
+ 
 = 1:3 
 
(B)  M
+
 : (M+2)
+ 
 = 3:1 
 
(C)  M
+
 : (M+2)
+
 = 1:1 
 
(D)  M
+
 : (M+2)
+ 
= 1:2 
 
Log k (Ar-COCl)    
hydrolysis) 
? 
? ? ??? ???? ?
? ? ?????? ?
Page 5


2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 1/20 
CY: CHEMISTRY 
 
Duration: Three Hours           Maximum Marks: 100 
Read the following instructions carefully. 
 
1. Do not open the seal of the Question Booklet until you are asked to do so by the invigilator. 
 
2. Take out the Optical Response Sheet (ORS) from this Question Booklet without breaking the seal 
and read the instructions printed on the ORS carefully.  
 
3. On the right half of the ORS, using ONLY a black ink ball point pen, (i) darken the bubble 
corresponding to your test paper code and the appropriate bubble under each digit of your registration 
number and (ii) write your registration number, your name and name of the examination centre and 
put your signature at the specified location. 
 
4. This Question Booklet contains 20 pages including blank pages for rough work. After you are 
permitted to open the seal, please check all pages and report discrepancies, if any, to the invigilator. 
 
5. There are a total of 65 questions carrying 100 marks. All these questions are of objective type. Each 
question has only one correct answer. Questions must be answered on the left hand side of the ORS 
by darkening the appropriate bubble (marked A, B, C, D) using ONLY a black ink ball point pen 
against the question number. For each question darken the bubble of the correct answer. More 
than one answer bubbled against a question will be treated as an incorrect response. 
 
6. Since bubbles darkened by the black ink ball point pen cannot be erased, candidates should darken 
the bubbles in the ORS very carefully. 
 
7. Questions Q.1 – Q.25 carry 1 mark each. Questions Q.26 – Q.55 carry 2 marks each. The 2 marks 
questions include two pairs of common data questions and two pairs of linked answer questions. The 
answer to the second question of the linked answer questions depends on the answer to the first 
question of the pair. If the first question in the linked pair is wrongly answered or is unattempted, then 
the answer to the second question in the pair will not be evaluated. 
 
8. Questions Q.56 – Q.65 belong to General Aptitude (GA) section and carry a total of 15 marks. 
Questions Q.56 – Q.60 carry 1 mark each, and questions Q.61 – Q.65 carry 2 marks each.   
 
9. Unattempted questions will result in zero mark and wrong answers will result in NEGATIVE marks.  
For all 1 mark questions, ? mark will be deducted for each wrong answer. For all 2 marks questions, 
? mark will be deducted for each wrong answer.  However, in the case of the linked answer question 
pair, there will be negative marks only for wrong answer to the first question and no negative marks 
for wrong answer to the second question.  
 
10. Calculator is allowed whereas charts, graph sheets or tables are NOT allowed in the examination hall. 
 
11. Rough work can be done on the question paper itself. Blank pages are provided at the end of the 
question paper for rough work. 
 
12. Before the start of the examination, write your name and registration number in the space provided 
below using a black ink ball point pen. 
 
Name 
 
 
Registration Number 
CY 
      
 
 
 
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 2/20 
Some Useful Data 
 
1. At T = 298 K, 2.303 0.0591
RT
F
? 
 
2. Atomic Numbers  
 
H     1 
B     5 
C     6 
N     7 
O     8 
P     15 
Ca   20 
Cr   24 
Mn  25 
Fe   26 
Co   27 
Ni   28 
Zn   30 
Ru   44 
    
 
3. Atomic weights (to the nearest integer) 
 
H      1 
C    12 
N    14 
O    16 
Ca   40 
 
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 3/20 
Q. 1 – Q. 25 carry one mark each 
 
Q.1  In the proton decoupled 
13
C NMR spectrum of  7-norbornanone, the number of signals obtained is  
 
(A)  7 (B)  3 (C)  4 (D)  5 
 
Q.2  Identify the most probable product in the given reaction 
 
 
 
(A)    
                  
(B)  
                          
(C) 
                  
(D) 
                         
 
Q.3  In the cyclization reaction given below, the most probable product formed is 
  
 
 
(A)
 
  
(B)   (C)
  
  (D)    
 
Q.4  If ?y and ?p
y
 are the uncertainties in the y-coordinate and the y component of the momentum of a 
particle respectively, then, according to uncertainty principle ?y?p
y
 is (
2
h
?
? and h is Planck’s 
constant) 
(A)  ? 
(B)  > 2 
(C)  > 
(D)  2 ? 
 
Q.5  The average length of a typical a-helix comprised of 10 amino acids is 
(A)  10 Å (B)  15 Å (C)  36 Å (D)  54 Å 
 
Q.6  Number of thymine residues in a 5000 kb DNA containing 23% guanine residues is 
(A)  2.70 × 10
6
 (B)  2.70 × 10
7
 (C)  1.35 × 10
6
 (D)  1.35 × 10
7
 
 
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 4/20 
Q.7  Shown below is a Hammett plot obtained for the reaction  
 
 
 
 
 
 
 
The change in slope of the plot indicates that   
 
(A)  the reaction does not follow linear free energy relationship 
(B)  electrons are being withdrawn from the transition state in the mechanism 
(C)  electrons are being donated to the transition state in the mechanism 
(D)  the mechanism of the reaction is changing 
 
 
Q.8  The ratio of relative intensities of the two molecular ion peaks of methyl bromide (CH
3
Br) in the 
mass spectrum is 
 
(A)  M
+ 
: (M+2)
+ 
 = 1:3 
 
(B)  M
+
 : (M+2)
+ 
 = 3:1 
 
(C)  M
+
 : (M+2)
+
 = 1:1 
 
(D)  M
+
 : (M+2)
+ 
= 1:2 
 
Log k (Ar-COCl)    
hydrolysis) 
? 
? ? ??? ???? ?
? ? ?????? ?
2012                                                                                                                                                                                                      CHEMISTRY –  CY 
CY 5/20 
Q.9  A disaccharide that will not give Benedict’s test and will not form osazone is  
(A)  maltose  (B)  lactose (C)  cellobiose (D)  sucrose 
 
Q.10  Choose the allowed transition 
(A)  
1
?
g
+
 ? 
3
?
u
+
 (B)  
1
?
g
+
 ? 
3
?
u
¯
 (C)  
1
?
g
+
 ? 
1
?
u
+
 (D)  
1
?
g
+
 ? 
1
?
u
¯ 
 
Q.11  The angular part of the wavefunction for the electron in a hydrogen atom is proportional to 
22
sin cos
i
e
?
?? . The values of the azimuthal quantum number ( l ) and the magnetic quantum 
number ( m ) are, respectively  
(A)  2 and 2 (B)  2 and –2  (C)  3 and 2  (D)  3 and –2 
 
Q.12  
Let 
C
x
? and 
C
z
? denote the wavefunctions of the 2p
x
 and 2p
z
 orbitals of carbon, respectively, and  
O
x
? and 
O
z
? represent the wavefunctions of the 2p
x
 and 2p
z
 orbitals of oxygen, respectively.  If  
1
c and 
2
c are constants used in linear combinations and the CO molecule is oriented along the  
z axis, then, according to molecular orbital theory, the p-bonding molecular orbital has a  
wavefunction given by  
(A)  
12
CO
zx
cc ?? ? (B)  
12
CO
zz
cc ?? ? 
(C)  
12
CO
xz
cc ?? ? (D)  
12
CO
xx
cc ?? ? 
 
Q.13  The bond that gives the most intense band in the infrared spectrum for its stretching vibration is 
(A)  C-H (B)  N-H (C)  O-H (D)  S-H 
 
Q.14  If x
A
 and x
B 
are the respective mole fractions of A and B in an ideal solution of the two and T
A
, T
B
,  
T are the fusion temperatures of pure A, pure B and the ideal solution respectively, then  
(A)  
()
11
1 exp
o
fus B
B
B
H
x
R T T
?? ?? ??
? ? ?
?? ??
?? ??
??
 
(B)  
()
11
1 exp
o
fus A
B
A
H
x
R T T
?? ? ??
? ? ?
?? ??
?? ??
??
 
(C)  
()
11
1 exp
o
fus B
B
B
H
x
R T T
?? ? ??
? ? ?
?? ??
?? ??
??
 
(D)  
()
11
1 exp
o
fus A
B
A
H
x
R T T
?? ?? ??
? ? ?
?? ??
?? ??
??
 
 
Q.15  For a reaction involving two steps given below  
 
 
 
assume that the first step attains equilibrium rapidly. The rate of formation of P is proportional to  
(A)  [G]
1/2 
(B)  [G] (C)   [G]
2 
(D)   [G]
3/2