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Page 1
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
EXERCISE. 12 A
Question 1:
Write the IUPAC name of the following:
(a)
3
33
3
|
|
CH
CH C CH
CH
??
(b)
3 2 3
3
|
CH CH CH CH
CH
? ? ?
(c)
| | |
|
H H H
H C C C H
H
? ? ? ?
(d)
3
3 2 2 3
3
|
|
CH
H C C CH CH CH
CH
??
(e)
3 2 3
CH C C CH CH ???
(f)
3
3
|
|
CH
H C C C H
CH
? ? ? ?
Page 2
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
EXERCISE. 12 A
Question 1:
Write the IUPAC name of the following:
(a)
3
33
3
|
|
CH
CH C CH
CH
??
(b)
3 2 3
3
|
CH CH CH CH
CH
? ? ?
(c)
| | |
|
H H H
H C C C H
H
? ? ? ?
(d)
3
3 2 2 3
3
|
|
CH
H C C CH CH CH
CH
??
(e)
3 2 3
CH C C CH CH ???
(f)
3
3
|
|
CH
H C C C H
CH
? ? ? ?
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
(g)
3 2 3
|
|
Cl
CH CH CH CH CH
Cl
? ? ?
(h)
33
22
2 2 3
||
|
CH CH
CH CH CH
CH CH CH
??
(i)
3
3 2 3
|
CH
CH CH CH CH ??
(j)
3 2 2 2 3
CH C C CH CH CH CH ? ? ?
(k)
3
3 2 2 2
3
|
|
CH
CH C CH CH CH CHO
CH
??
(l)
3 2 2 3
|
CH CH CH CH CH
OH
??
(m)
3 2 2
3
|
CH CHCH CH COOH
CH
(n)
3
3 2 3
|
|
CH
CH C CH CH
Br
??
Page 3
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
EXERCISE. 12 A
Question 1:
Write the IUPAC name of the following:
(a)
3
33
3
|
|
CH
CH C CH
CH
??
(b)
3 2 3
3
|
CH CH CH CH
CH
? ? ?
(c)
| | |
|
H H H
H C C C H
H
? ? ? ?
(d)
3
3 2 2 3
3
|
|
CH
H C C CH CH CH
CH
??
(e)
3 2 3
CH C C CH CH ???
(f)
3
3
|
|
CH
H C C C H
CH
? ? ? ?
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
(g)
3 2 3
|
|
Cl
CH CH CH CH CH
Cl
? ? ?
(h)
33
22
2 2 3
||
|
CH CH
CH CH CH
CH CH CH
??
(i)
3
3 2 3
|
CH
CH CH CH CH ??
(j)
3 2 2 2 3
CH C C CH CH CH CH ? ? ?
(k)
3
3 2 2 2
3
|
|
CH
CH C CH CH CH CHO
CH
??
(l)
3 2 2 3
|
CH CH CH CH CH
OH
??
(m)
3 2 2
3
|
CH CHCH CH COOH
CH
(n)
3
3 2 3
|
|
CH
CH C CH CH
Br
??
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
(o)
3
3 2 2
|
CH
CH CH CH CH Br ? ? ?
Solution 1:
(a) 2,2- dimethylpropane
(b) 2-methyl butane
(c) Prop-1-ene
(d) 2,2- dimethyl pentane
(e) Pent-2-yne
(f) 3-methyl but-1-yne
(g) 2,3-dichloropentane
(h) 3-methylheptane
(i) 2-methyl butane
(j) Hept-2-yne
(k) 2,2- dimethyl hexanal
(l) Pentan-2-ol
(m) 4-methylpentanoic acid
(n) 2-bromo2-methyl butane
(o) 1- bromo3-methyl butane
Question 2:
Write the structure of the following compounds:
(a) Prop-1-ene, (b) 2, 3 – dimethyl butane,
(c) 2 – methyl propane (d) 3-hexene
(e) prop– 1 – yne (f) 2-methylprop – 1- ene,
(g) Alcohol with molecular formula C4H10O
Solution 2:
The structure of the following compounds are:
(a) Prop-1-ene
CH3 – CH = CH2
(b) 2,3-dimethylbutane
CH3 - CH(CH3) - CH(CH3) - CH3
(c) 2-methylpropane
CH3 - CH(CH3) - CH3
(d) 3-hexene
CH3 - CH2 – CH = CH - CH2 - CH3
(e) Prop-1-yne
CH3 - C?CH
(f) 2-methylprop-1-ene
CH3 - C(CH3) = CH2
(g) Alcohol with molecular formula C4H10O
CH3 - CH2 - CH2 - CH2 – OH
Page 4
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
EXERCISE. 12 A
Question 1:
Write the IUPAC name of the following:
(a)
3
33
3
|
|
CH
CH C CH
CH
??
(b)
3 2 3
3
|
CH CH CH CH
CH
? ? ?
(c)
| | |
|
H H H
H C C C H
H
? ? ? ?
(d)
3
3 2 2 3
3
|
|
CH
H C C CH CH CH
CH
??
(e)
3 2 3
CH C C CH CH ???
(f)
3
3
|
|
CH
H C C C H
CH
? ? ? ?
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
(g)
3 2 3
|
|
Cl
CH CH CH CH CH
Cl
? ? ?
(h)
33
22
2 2 3
||
|
CH CH
CH CH CH
CH CH CH
??
(i)
3
3 2 3
|
CH
CH CH CH CH ??
(j)
3 2 2 2 3
CH C C CH CH CH CH ? ? ?
(k)
3
3 2 2 2
3
|
|
CH
CH C CH CH CH CHO
CH
??
(l)
3 2 2 3
|
CH CH CH CH CH
OH
??
(m)
3 2 2
3
|
CH CHCH CH COOH
CH
(n)
3
3 2 3
|
|
CH
CH C CH CH
Br
??
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
(o)
3
3 2 2
|
CH
CH CH CH CH Br ? ? ?
Solution 1:
(a) 2,2- dimethylpropane
(b) 2-methyl butane
(c) Prop-1-ene
(d) 2,2- dimethyl pentane
(e) Pent-2-yne
(f) 3-methyl but-1-yne
(g) 2,3-dichloropentane
(h) 3-methylheptane
(i) 2-methyl butane
(j) Hept-2-yne
(k) 2,2- dimethyl hexanal
(l) Pentan-2-ol
(m) 4-methylpentanoic acid
(n) 2-bromo2-methyl butane
(o) 1- bromo3-methyl butane
Question 2:
Write the structure of the following compounds:
(a) Prop-1-ene, (b) 2, 3 – dimethyl butane,
(c) 2 – methyl propane (d) 3-hexene
(e) prop– 1 – yne (f) 2-methylprop – 1- ene,
(g) Alcohol with molecular formula C4H10O
Solution 2:
The structure of the following compounds are:
(a) Prop-1-ene
CH3 – CH = CH2
(b) 2,3-dimethylbutane
CH3 - CH(CH3) - CH(CH3) - CH3
(c) 2-methylpropane
CH3 - CH(CH3) - CH3
(d) 3-hexene
CH3 - CH2 – CH = CH - CH2 - CH3
(e) Prop-1-yne
CH3 - C?CH
(f) 2-methylprop-1-ene
CH3 - C(CH3) = CH2
(g) Alcohol with molecular formula C4H10O
CH3 - CH2 - CH2 - CH2 – OH
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
Question 3:
Choose the correct answer:
(a)
5 11
CH
is an
(i) alkane (ii) alkene (iii) alkyne (iv) alkyl group
(b) A hydrocarbon of the general CnH2n is
(i) C15H30 (ii) C12H26.
(iii) C8H20 (iv) C6H14
(c) A hydrocarbon with molecular mass 72 is
(i) an alkane (ii) an alkene (iii) an alkyne
(d) The total number of different carbon chains that four carbon atoms form in alkane is
(i) 5 (ii) 4 (iii) 3 (iv) 2
(e) CH3 – CH2 – OH and CH3 – O – CH3 are
(i) position isomers (ii) chain isomers
(iii) homologous (iv) functional – group isomers
(f) The IUPAC name of the compound is
3
3 2 2 2 3
|
CH
CH CH CH CH CH CH ? ? ? ? ?
(i) 3-trimethylhexane (ii) 3- methyl hexane (iii) 4 – methyl hexane
Solution 3:
(a) Correct answer: (iv)
CnH2n + 1 is the formula for alkyl group. Hence it is C5H11.
(b) Correct answer: (i)
A hydrocarbon of general CnH2n is C15H30.
(c) Correct answer: (ii)
As the formula of Alkene is CnH2n. Thus n + 2n = 72
3n = 72
n = 24
By filling value we get the molecular mass 72.
(d) (iv)
The total number of carbon chains that four carbon atoms form in alkane is 2. They are:
HHHH
| | | |
H C C C C H
| | | |
H H H H
?????
Page 5
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
EXERCISE. 12 A
Question 1:
Write the IUPAC name of the following:
(a)
3
33
3
|
|
CH
CH C CH
CH
??
(b)
3 2 3
3
|
CH CH CH CH
CH
? ? ?
(c)
| | |
|
H H H
H C C C H
H
? ? ? ?
(d)
3
3 2 2 3
3
|
|
CH
H C C CH CH CH
CH
??
(e)
3 2 3
CH C C CH CH ???
(f)
3
3
|
|
CH
H C C C H
CH
? ? ? ?
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
(g)
3 2 3
|
|
Cl
CH CH CH CH CH
Cl
? ? ?
(h)
33
22
2 2 3
||
|
CH CH
CH CH CH
CH CH CH
??
(i)
3
3 2 3
|
CH
CH CH CH CH ??
(j)
3 2 2 2 3
CH C C CH CH CH CH ? ? ?
(k)
3
3 2 2 2
3
|
|
CH
CH C CH CH CH CHO
CH
??
(l)
3 2 2 3
|
CH CH CH CH CH
OH
??
(m)
3 2 2
3
|
CH CHCH CH COOH
CH
(n)
3
3 2 3
|
|
CH
CH C CH CH
Br
??
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
(o)
3
3 2 2
|
CH
CH CH CH CH Br ? ? ?
Solution 1:
(a) 2,2- dimethylpropane
(b) 2-methyl butane
(c) Prop-1-ene
(d) 2,2- dimethyl pentane
(e) Pent-2-yne
(f) 3-methyl but-1-yne
(g) 2,3-dichloropentane
(h) 3-methylheptane
(i) 2-methyl butane
(j) Hept-2-yne
(k) 2,2- dimethyl hexanal
(l) Pentan-2-ol
(m) 4-methylpentanoic acid
(n) 2-bromo2-methyl butane
(o) 1- bromo3-methyl butane
Question 2:
Write the structure of the following compounds:
(a) Prop-1-ene, (b) 2, 3 – dimethyl butane,
(c) 2 – methyl propane (d) 3-hexene
(e) prop– 1 – yne (f) 2-methylprop – 1- ene,
(g) Alcohol with molecular formula C4H10O
Solution 2:
The structure of the following compounds are:
(a) Prop-1-ene
CH3 – CH = CH2
(b) 2,3-dimethylbutane
CH3 - CH(CH3) - CH(CH3) - CH3
(c) 2-methylpropane
CH3 - CH(CH3) - CH3
(d) 3-hexene
CH3 - CH2 – CH = CH - CH2 - CH3
(e) Prop-1-yne
CH3 - C?CH
(f) 2-methylprop-1-ene
CH3 - C(CH3) = CH2
(g) Alcohol with molecular formula C4H10O
CH3 - CH2 - CH2 - CH2 – OH
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
Question 3:
Choose the correct answer:
(a)
5 11
CH
is an
(i) alkane (ii) alkene (iii) alkyne (iv) alkyl group
(b) A hydrocarbon of the general CnH2n is
(i) C15H30 (ii) C12H26.
(iii) C8H20 (iv) C6H14
(c) A hydrocarbon with molecular mass 72 is
(i) an alkane (ii) an alkene (iii) an alkyne
(d) The total number of different carbon chains that four carbon atoms form in alkane is
(i) 5 (ii) 4 (iii) 3 (iv) 2
(e) CH3 – CH2 – OH and CH3 – O – CH3 are
(i) position isomers (ii) chain isomers
(iii) homologous (iv) functional – group isomers
(f) The IUPAC name of the compound is
3
3 2 2 2 3
|
CH
CH CH CH CH CH CH ? ? ? ? ?
(i) 3-trimethylhexane (ii) 3- methyl hexane (iii) 4 – methyl hexane
Solution 3:
(a) Correct answer: (iv)
CnH2n + 1 is the formula for alkyl group. Hence it is C5H11.
(b) Correct answer: (i)
A hydrocarbon of general CnH2n is C15H30.
(c) Correct answer: (ii)
As the formula of Alkene is CnH2n. Thus n + 2n = 72
3n = 72
n = 24
By filling value we get the molecular mass 72.
(d) (iv)
The total number of carbon chains that four carbon atoms form in alkane is 2. They are:
HHHH
| | | |
H C C C C H
| | | |
H H H H
?????
Class X Chapter 12 – Organic Chemistry Biology
______________________________________________________________________________
(e) Correct answer: (iv)
Alcohol and ether are functional isomers as they have same molecular formula but different
functional groups.
(f) Correct answer: (ii)
3 2 2 2 3
3
CH CH CH CH CH CH
|
CH
? ? ? ? ?
The IUPAC name of this compound is: 3-methyl hexane.
Question 4:
Fill in the blanks:
(a) Propane and ethane are ____________
(b) A saturated hydrocarbon does not participate in a/an _________ reaction.
(c) Succeeding members of a homologous series differ by ______________
(d) As the molecular masses of hydrocarbons increase, their boiling points ________ and
melting point ____________
(e) C25H52 and C50H102 belong to _______________ homologous series.
(f) CO is an__________ Compound.
(g) The chemical properties of an organic compound are largely decided by the ___________
and the physical properties of an organic compound are largely decided by the ___________
(h) CHO is the functional group of an __________.
(i) The root in the IUPAC name of an organic compound depends upon the number of carbon
atoms in _____________
(j) But-1-ene and but-2-ene are examples of ___________ isomerism.
Solution 4:
(a) Propane and ethane are homologues.
(b) A saturated hydrocarbon does not participate in a/an addition reaction.
(c) Succeeding members of a homologous series differ by CH2.
(d) As the molecular masses of hydrocarbons increase, their boiling points Increase and melting
point increase.
(e) C25H52 and C50H102 belong to the same homologous series.
(f) CO is an organic Compound.
(g) The physical and chemical properties of an organic compound are largely decided by
the Functional group.
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