JEE Main 2021 Answer Key Chemistry - Morning Shift (16-03-2021) JEE Notes | EduRev

Mock Test Series for JEE Main & Advanced 2021

JEE : JEE Main 2021 Answer Key Chemistry - Morning Shift (16-03-2021) JEE Notes | EduRev

 Page 1


 
 
16
th
 MARCH 2021 | Shift 1
1. Among the following, the aromatic compounds are: 
 (A)
   
(B) 
 (C)
   
 (D)
 
 Choose the correct answer from the following options: 
(1) (A) and (B) only   (2) (A), (B) and (C) only 
(3) (B), (C) and (D) only  (4) (B) and (C) only  
Ans. (4) 
Sol. 
 
 
6 ? electron 
6 ? electron 
 
 
2. Given below are two statements: 
 Statement I: H
2
O
2
 can act as both oxidising and reducing agent in basic medium. 
 Statement II: In the hydrogen economy, the energy is transmitted in the form of dihydrogen. 
 In the light of the above statements, choose the correct answer from the options given below: 
 (1) Statement I is false but statement II is true 
 (2) Both Statement I and Statement II are true 
 (3) Statement I is true but statement II is false 
 (4) Both Statement I and Statement II are false 
Ans. (2) 
Sol. H
2
O
2
 can act as oxidising & reducing agent in both acidic & basic medium. 
 
 
3. Which of the following is Lindlar catalyst? 
 (1) Zinc chloride and HCl 
 (2) Partially deactivated palladised charcoal 
 (3) Sodium and Liquid NH
3 
 (4) Cold dilute solution of KMnO
4 
Ans. (2) 
Sol. Lindlar's catalyst ? Pd/CaCo
3
 + (CH
3
COO)
2
 Pb + quinolene 
 
 
 
 
? ? 
CH
2
Page 2


 
 
16
th
 MARCH 2021 | Shift 1
1. Among the following, the aromatic compounds are: 
 (A)
   
(B) 
 (C)
   
 (D)
 
 Choose the correct answer from the following options: 
(1) (A) and (B) only   (2) (A), (B) and (C) only 
(3) (B), (C) and (D) only  (4) (B) and (C) only  
Ans. (4) 
Sol. 
 
 
6 ? electron 
6 ? electron 
 
 
2. Given below are two statements: 
 Statement I: H
2
O
2
 can act as both oxidising and reducing agent in basic medium. 
 Statement II: In the hydrogen economy, the energy is transmitted in the form of dihydrogen. 
 In the light of the above statements, choose the correct answer from the options given below: 
 (1) Statement I is false but statement II is true 
 (2) Both Statement I and Statement II are true 
 (3) Statement I is true but statement II is false 
 (4) Both Statement I and Statement II are false 
Ans. (2) 
Sol. H
2
O
2
 can act as oxidising & reducing agent in both acidic & basic medium. 
 
 
3. Which of the following is Lindlar catalyst? 
 (1) Zinc chloride and HCl 
 (2) Partially deactivated palladised charcoal 
 (3) Sodium and Liquid NH
3 
 (4) Cold dilute solution of KMnO
4 
Ans. (2) 
Sol. Lindlar's catalyst ? Pd/CaCo
3
 + (CH
3
COO)
2
 Pb + quinolene 
 
 
 
 
? ? 
CH
2
 
 
4. In chromatography technique, the purification of compound is independent of: 
 (1) Length of the column or TLC plate 
 (2) Mobility or flow of solvent system 
 (3) Physical state of the pure compound 
 (4) Solubility of the compound 
Ans. (3) 
Sol. Based on NCERT 
 
  
5. Which among the following pairs of Vitamins is stored in our body relatively for longer duration? 
 (1) Ascorbic acid and Vitamin D  (2) Thiamine and Ascorbic acid 
 (3) Vitamin A and Vitamin D   (4) Thiamine and Vitamin A 
Ans. (3) 
Sol. Based on NCERT 
 
6. 
 
In the above chemical reaction, intermediate "X" and reagent/condition "A" are: 
 (1)
  
(2) 
 (3)
 
 (4)
 
Ans. (3) 
Sol. 
 
NH
2
 
NaNO
2
,HCl 
273-278K 
N
2
Cl
–
 
+ 
H
2
O/ ? 
OH 
 
 
  
2
NO
 
; A-H
2
O/ ? X-
2
N Cl
? ?
; A-H
2
O/ ? X-
2
N Cl
? ?
; A-H
2
O/NaOH X-
NO
2
 
; A-H
2
O/NaOH X-
NH
2
"X"
"A" NaNO 2, HCl
273-278K
OH
Major Product
Page 3


 
 
16
th
 MARCH 2021 | Shift 1
1. Among the following, the aromatic compounds are: 
 (A)
   
(B) 
 (C)
   
 (D)
 
 Choose the correct answer from the following options: 
(1) (A) and (B) only   (2) (A), (B) and (C) only 
(3) (B), (C) and (D) only  (4) (B) and (C) only  
Ans. (4) 
Sol. 
 
 
6 ? electron 
6 ? electron 
 
 
2. Given below are two statements: 
 Statement I: H
2
O
2
 can act as both oxidising and reducing agent in basic medium. 
 Statement II: In the hydrogen economy, the energy is transmitted in the form of dihydrogen. 
 In the light of the above statements, choose the correct answer from the options given below: 
 (1) Statement I is false but statement II is true 
 (2) Both Statement I and Statement II are true 
 (3) Statement I is true but statement II is false 
 (4) Both Statement I and Statement II are false 
Ans. (2) 
Sol. H
2
O
2
 can act as oxidising & reducing agent in both acidic & basic medium. 
 
 
3. Which of the following is Lindlar catalyst? 
 (1) Zinc chloride and HCl 
 (2) Partially deactivated palladised charcoal 
 (3) Sodium and Liquid NH
3 
 (4) Cold dilute solution of KMnO
4 
Ans. (2) 
Sol. Lindlar's catalyst ? Pd/CaCo
3
 + (CH
3
COO)
2
 Pb + quinolene 
 
 
 
 
? ? 
CH
2
 
 
4. In chromatography technique, the purification of compound is independent of: 
 (1) Length of the column or TLC plate 
 (2) Mobility or flow of solvent system 
 (3) Physical state of the pure compound 
 (4) Solubility of the compound 
Ans. (3) 
Sol. Based on NCERT 
 
  
5. Which among the following pairs of Vitamins is stored in our body relatively for longer duration? 
 (1) Ascorbic acid and Vitamin D  (2) Thiamine and Ascorbic acid 
 (3) Vitamin A and Vitamin D   (4) Thiamine and Vitamin A 
Ans. (3) 
Sol. Based on NCERT 
 
6. 
 
In the above chemical reaction, intermediate "X" and reagent/condition "A" are: 
 (1)
  
(2) 
 (3)
 
 (4)
 
Ans. (3) 
Sol. 
 
NH
2
 
NaNO
2
,HCl 
273-278K 
N
2
Cl
–
 
+ 
H
2
O/ ? 
OH 
 
 
  
2
NO
 
; A-H
2
O/ ? X-
2
N Cl
? ?
; A-H
2
O/ ? X-
2
N Cl
? ?
; A-H
2
O/NaOH X-
NO
2
 
; A-H
2
O/NaOH X-
NH
2
"X"
"A" NaNO 2, HCl
273-278K
OH
Major Product
 
 
16
th
 MARCH 2021 | Shift 1
 
7. Which of the following reaction DOES NOT involve Hoffmann bromamide degradation? 
 (1)   
 (2)  
 
 (3)   
 (4)  
 
Ans. (4) 
Sol. 
 (1) 
 
CH
2
–C–NH
2
 
O 
Br
2
+NaOH 
CH
2
–NH
2
 
 
 (2) 
 
CN 
KOH/H
2
O NH
2
 
C 
O 
Br
2
/NaOH 
NH
2
 
 
 (3) 
 
O 
NH
3
 
Cl 
O 
NH
2
 Br
2
/NaOH 
NH
2
 
 
 
 
CH
2
–C–CH
3 (i) Br 2,NaOH/H
+ 
O
CH
2
–NH
2
(ii) NH 3/ ?
(iii) LiAlH 4/H 2O
Cl
(i) NH 3, NaOH 
NH
2
(ii) Br 2,NaOH
O
CN
(i) KOH,H 2O
NH
2
(ii) Br 2,NaOH
CH
2
–C–NH
2
 
Br 2,NaOH
O
CH
2
–NH
2
Page 4


 
 
16
th
 MARCH 2021 | Shift 1
1. Among the following, the aromatic compounds are: 
 (A)
   
(B) 
 (C)
   
 (D)
 
 Choose the correct answer from the following options: 
(1) (A) and (B) only   (2) (A), (B) and (C) only 
(3) (B), (C) and (D) only  (4) (B) and (C) only  
Ans. (4) 
Sol. 
 
 
6 ? electron 
6 ? electron 
 
 
2. Given below are two statements: 
 Statement I: H
2
O
2
 can act as both oxidising and reducing agent in basic medium. 
 Statement II: In the hydrogen economy, the energy is transmitted in the form of dihydrogen. 
 In the light of the above statements, choose the correct answer from the options given below: 
 (1) Statement I is false but statement II is true 
 (2) Both Statement I and Statement II are true 
 (3) Statement I is true but statement II is false 
 (4) Both Statement I and Statement II are false 
Ans. (2) 
Sol. H
2
O
2
 can act as oxidising & reducing agent in both acidic & basic medium. 
 
 
3. Which of the following is Lindlar catalyst? 
 (1) Zinc chloride and HCl 
 (2) Partially deactivated palladised charcoal 
 (3) Sodium and Liquid NH
3 
 (4) Cold dilute solution of KMnO
4 
Ans. (2) 
Sol. Lindlar's catalyst ? Pd/CaCo
3
 + (CH
3
COO)
2
 Pb + quinolene 
 
 
 
 
? ? 
CH
2
 
 
4. In chromatography technique, the purification of compound is independent of: 
 (1) Length of the column or TLC plate 
 (2) Mobility or flow of solvent system 
 (3) Physical state of the pure compound 
 (4) Solubility of the compound 
Ans. (3) 
Sol. Based on NCERT 
 
  
5. Which among the following pairs of Vitamins is stored in our body relatively for longer duration? 
 (1) Ascorbic acid and Vitamin D  (2) Thiamine and Ascorbic acid 
 (3) Vitamin A and Vitamin D   (4) Thiamine and Vitamin A 
Ans. (3) 
Sol. Based on NCERT 
 
6. 
 
In the above chemical reaction, intermediate "X" and reagent/condition "A" are: 
 (1)
  
(2) 
 (3)
 
 (4)
 
Ans. (3) 
Sol. 
 
NH
2
 
NaNO
2
,HCl 
273-278K 
N
2
Cl
–
 
+ 
H
2
O/ ? 
OH 
 
 
  
2
NO
 
; A-H
2
O/ ? X-
2
N Cl
? ?
; A-H
2
O/ ? X-
2
N Cl
? ?
; A-H
2
O/NaOH X-
NO
2
 
; A-H
2
O/NaOH X-
NH
2
"X"
"A" NaNO 2, HCl
273-278K
OH
Major Product
 
 
16
th
 MARCH 2021 | Shift 1
 
7. Which of the following reaction DOES NOT involve Hoffmann bromamide degradation? 
 (1)   
 (2)  
 
 (3)   
 (4)  
 
Ans. (4) 
Sol. 
 (1) 
 
CH
2
–C–NH
2
 
O 
Br
2
+NaOH 
CH
2
–NH
2
 
 
 (2) 
 
CN 
KOH/H
2
O NH
2
 
C 
O 
Br
2
/NaOH 
NH
2
 
 
 (3) 
 
O 
NH
3
 
Cl 
O 
NH
2
 Br
2
/NaOH 
NH
2
 
 
 
 
CH
2
–C–CH
3 (i) Br 2,NaOH/H
+ 
O
CH
2
–NH
2
(ii) NH 3/ ?
(iii) LiAlH 4/H 2O
Cl
(i) NH 3, NaOH 
NH
2
(ii) Br 2,NaOH
O
CN
(i) KOH,H 2O
NH
2
(ii) Br 2,NaOH
CH
2
–C–NH
2
 
Br 2,NaOH
O
CH
2
–NH
2
 
 
 
 
(4) 
 
Br
2
+NaOH/n
+
 
O 
CH
2
–CH
2
–NH
2
 
CH
2
–C–CH
3
 
O 
CH
2
–C–OH 
+ CHBr
2
 
NH
3
/ ? 
LiAlH
4
/H
2
O 
CH
2
–C–NH
2
 
O 
 
 
 
8. A group 15 element, which is a metal and forms a hydride with strongest reducing power 
among group 15 hydrides. The element is: 
 (1) Bi   (2) As   (3) P   (4) Sb 
Ans. (1) 
Sol. BiH
3
 is strongest reducing agent among the hydrides of 15 group elements as Bi – H bond 
dissociation energy is very less. 
 
9. Given below are two statement : One is labelled as Assertion A and the other is labelled as 
Reason R: 
 Assertion A: Size of Bk
3+
 ion is less than Np
3+
 ion. 
 Reason R: The aboveis a consequence of the lanthanoid contraction. 
 In the light of the above statements, choose the correct answer from the options given below: 
 (1) A is false but R is true 
 (2) Both A and R are true but R is not the correct explanation of A 
 (3) A is true but R is false 
 (4) Both A and R are true and R is the correct explanation of A 
Ans. (4) 
Sol. 
3
93
Np
?
 
3
97
BK
?
 
as atomic No. increase ionic size dec. (lanthanide/Actinide) contraction. 
 
  
Page 5


 
 
16
th
 MARCH 2021 | Shift 1
1. Among the following, the aromatic compounds are: 
 (A)
   
(B) 
 (C)
   
 (D)
 
 Choose the correct answer from the following options: 
(1) (A) and (B) only   (2) (A), (B) and (C) only 
(3) (B), (C) and (D) only  (4) (B) and (C) only  
Ans. (4) 
Sol. 
 
 
6 ? electron 
6 ? electron 
 
 
2. Given below are two statements: 
 Statement I: H
2
O
2
 can act as both oxidising and reducing agent in basic medium. 
 Statement II: In the hydrogen economy, the energy is transmitted in the form of dihydrogen. 
 In the light of the above statements, choose the correct answer from the options given below: 
 (1) Statement I is false but statement II is true 
 (2) Both Statement I and Statement II are true 
 (3) Statement I is true but statement II is false 
 (4) Both Statement I and Statement II are false 
Ans. (2) 
Sol. H
2
O
2
 can act as oxidising & reducing agent in both acidic & basic medium. 
 
 
3. Which of the following is Lindlar catalyst? 
 (1) Zinc chloride and HCl 
 (2) Partially deactivated palladised charcoal 
 (3) Sodium and Liquid NH
3 
 (4) Cold dilute solution of KMnO
4 
Ans. (2) 
Sol. Lindlar's catalyst ? Pd/CaCo
3
 + (CH
3
COO)
2
 Pb + quinolene 
 
 
 
 
? ? 
CH
2
 
 
4. In chromatography technique, the purification of compound is independent of: 
 (1) Length of the column or TLC plate 
 (2) Mobility or flow of solvent system 
 (3) Physical state of the pure compound 
 (4) Solubility of the compound 
Ans. (3) 
Sol. Based on NCERT 
 
  
5. Which among the following pairs of Vitamins is stored in our body relatively for longer duration? 
 (1) Ascorbic acid and Vitamin D  (2) Thiamine and Ascorbic acid 
 (3) Vitamin A and Vitamin D   (4) Thiamine and Vitamin A 
Ans. (3) 
Sol. Based on NCERT 
 
6. 
 
In the above chemical reaction, intermediate "X" and reagent/condition "A" are: 
 (1)
  
(2) 
 (3)
 
 (4)
 
Ans. (3) 
Sol. 
 
NH
2
 
NaNO
2
,HCl 
273-278K 
N
2
Cl
–
 
+ 
H
2
O/ ? 
OH 
 
 
  
2
NO
 
; A-H
2
O/ ? X-
2
N Cl
? ?
; A-H
2
O/ ? X-
2
N Cl
? ?
; A-H
2
O/NaOH X-
NO
2
 
; A-H
2
O/NaOH X-
NH
2
"X"
"A" NaNO 2, HCl
273-278K
OH
Major Product
 
 
16
th
 MARCH 2021 | Shift 1
 
7. Which of the following reaction DOES NOT involve Hoffmann bromamide degradation? 
 (1)   
 (2)  
 
 (3)   
 (4)  
 
Ans. (4) 
Sol. 
 (1) 
 
CH
2
–C–NH
2
 
O 
Br
2
+NaOH 
CH
2
–NH
2
 
 
 (2) 
 
CN 
KOH/H
2
O NH
2
 
C 
O 
Br
2
/NaOH 
NH
2
 
 
 (3) 
 
O 
NH
3
 
Cl 
O 
NH
2
 Br
2
/NaOH 
NH
2
 
 
 
 
CH
2
–C–CH
3 (i) Br 2,NaOH/H
+ 
O
CH
2
–NH
2
(ii) NH 3/ ?
(iii) LiAlH 4/H 2O
Cl
(i) NH 3, NaOH 
NH
2
(ii) Br 2,NaOH
O
CN
(i) KOH,H 2O
NH
2
(ii) Br 2,NaOH
CH
2
–C–NH
2
 
Br 2,NaOH
O
CH
2
–NH
2
 
 
 
 
(4) 
 
Br
2
+NaOH/n
+
 
O 
CH
2
–CH
2
–NH
2
 
CH
2
–C–CH
3
 
O 
CH
2
–C–OH 
+ CHBr
2
 
NH
3
/ ? 
LiAlH
4
/H
2
O 
CH
2
–C–NH
2
 
O 
 
 
 
8. A group 15 element, which is a metal and forms a hydride with strongest reducing power 
among group 15 hydrides. The element is: 
 (1) Bi   (2) As   (3) P   (4) Sb 
Ans. (1) 
Sol. BiH
3
 is strongest reducing agent among the hydrides of 15 group elements as Bi – H bond 
dissociation energy is very less. 
 
9. Given below are two statement : One is labelled as Assertion A and the other is labelled as 
Reason R: 
 Assertion A: Size of Bk
3+
 ion is less than Np
3+
 ion. 
 Reason R: The aboveis a consequence of the lanthanoid contraction. 
 In the light of the above statements, choose the correct answer from the options given below: 
 (1) A is false but R is true 
 (2) Both A and R are true but R is not the correct explanation of A 
 (3) A is true but R is false 
 (4) Both A and R are true and R is the correct explanation of A 
Ans. (4) 
Sol. 
3
93
Np
?
 
3
97
BK
?
 
as atomic No. increase ionic size dec. (lanthanide/Actinide) contraction. 
 
  
 
 
16
th
 MARCH 2021 | Shift 1
10.
 
 
 The products "A" and "B" formed in above reactions are: 
 (1) 
  
 (2)  
 (3) 
  
 (4) 
 
Ans. (1) 
Sol.  
 
OH CH
3
 
20%/H
3
Po
4
 
358 K 
CH
3
 
Cl CH
3
 
(CH
3
)
3
CO
–
K
+
+ 
CH
2
 
Saytzeff's alkene(A) 
Hoff mann's alkene(B) 
 
11. The type of pollution that gets increased during the day time and in the presence of O
3
is : 
 (1) Global warming     (2) Reducing smog 
 (3) Acid rain     (4) Oxidising smog 
Ans. (4) 
Sol. NO + O
2
 ?? NO
2
 
 NO + O
3
 ?? NO
2
 + O
2
 
 NO
2
 
hv
? ? ? ? NO + [O] 
 O + O
2
 ? ? ? ?
? ? ? ?
 O
3
 
               Bad ozone 
 CH
4
 + O
2
 ?? CH
2
 = O + H
2
O 
 Vehicle 
 Exhaust 
 
CH
3
A–
CH
3
B–
CH
2
A–
CH
2
B–
CH
2
A–
CH
3
B–
CH
3
A–
CH
2
B–
"A"
H
3
C OH
20% H 3PO 4
358K
(Major Product)
H
3
C Cl
"B"
(Major Product)
(CH 3) 3CO
–
K
+
Read More
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