Chemrock
DPP No. -
SUB. CHEMISTRY
TOPIC ISOMERISM
: EXERCISE :
1.
Isomers of propionic acid are
(1) HCOOC2H5 and CH3COOCH3
(3) CH3COOCH3 and C3H7OH
(2)
(4)
HCOOC2H5 and C3H7COOH
C3H7OH and CH3COCH3
2.
A compound of molecular formula C7H16 shows optical isomerism, compound will be (1) 2, 3-Dimethylpentane
(2) 2, 2-Dimethylbutane
(3) 2-Methylhexane
(4) None of the above
3.
2-butene shows geometrical isomerism due to (1) Restricted rotation about double bond (2)
(3) Free rotation about single bond
(4)
Free rotation about double bond
Chiral carbon
4.
Stero isomers which are not the mirror images of each other are called
(1) Enantiomers
(2) Meso isomers
(3) tantomers
(4)
5.
n-Butyl alcohol and isobutyl alcohol exhibit (1) Metamerism (2) Chain isomersism
(3) Position isomerism (4) Stereo isomerism
6.
An organic compound exhibits optical isomerism when
(1) Four groups linked to carbon atom are different
(2) Three groups linked to carbon atom are different
(3) Two groups linked to carbon atom are different
(4) All the groups linked to carbon atom are same
7.
C7H9N has how many isomeric forms that contain a benzene ring (1) 4
(2) 5
(3) 6
(4)
7
8.
The isomerism exhibited by alkyl cyanide and alkyl isocyanide is
(1) Functional
(2) Positional
(3) Tautomerism
(4)
Metamerism
9.
Which of the following will have geometrical isomers
(1) 2-Methylpropene (2) 2-Butene
(3) 1-Butene
(4) Propene
10.
The isomers which can be converted into another forms by rotation of the molecles around
single bond are
(1) Geometrical isomers
(2) Conformers
(3) Enatiomers
(4) Diastereomers
11.
CH3CH2CH = CH2 and CH3 – CH = CH – CH3 show (1) Chain isomerism (2) Position isomerism (3) Functional isomerism (4) Metamerism
12.
The total number of isomers formed by C 5H10 is (10 2
(2) 3
(3) 4
(4)
5
13.
Total number of isomers of C6H14 are
(1) 4
(2) 5
6
(4)
7
14.
An isomer of ethanol is
(1) Methanol
(2)
Diethyl ether
(4)
Ethylene glycol
15.
Name the compound, that is not isomer with diethyl ether (1) n-Propylmethyl ether
(2) Butane-1-ol
(3) 2-Methylpropane-2-ol
(4) Butanone
16.
Diethyl ether and methyl n-propyl ether are
(1) Position isomers (2) Functional isomers
(4)
Chain isomers
17.
The type of isomerism exhibited by maleic and fumaric is
(1) Functional isomerism
(2) Optical isomerism
(3) Cis-trans isomerism
(4) Position isomerism
18.
A mixture of equimolecular amount of enantiomorphs is known as
(1) A atutomeric mixture
(2) A racemic mixture
(3) An optically inactive mixture
(4) Azeotropic mixture
19.
The number of possible secondary amine of formula C4H11N
(1) 1
(2) 2
(3) 3
(3)
Dimethyl ether (3)
1
(3) Metamers
(4)
Diastereoisomers
4
Chemrock
SUB. CHEMISTRY
DPP No. 20.
21.
TOPIC ISOMERISM
Ethanoyl chloride is not an isomer of
(1) Chloroethylene oxide
(3) 2-Chloroethene-1-ol
(2)
(4)
Which type of isomerism is shown by pentanone
(1) Chain isomerism (2) Position isomerism
2-Chloroethanal
Ethylene chlorohydrin
(3) Functional isomerism
(4) All of these
22.
The type of isomerism shown by CH3CH(OH)COOH is
(1) Position isomerism
(2) Stereo isomerism
(3) Optical isomerism
(4) Cis-trans isomerism
23.
Functional isomers of alkadiene is
(1) Alkyne
(2) Cycloalkene
24.
A compound has 3 chiral carbon atoms. The number of possible optical isomers it can have is
(1) 3
(2) 2
(3) 8
(4) 4
25.
Can homologues be isomers
(1) Yes
(2) No
(3)
(3)
Alkene
(4)
Sometimes
1 & 2 both
(4)
None
Staggered form (4)
None
26.
In butane, which form has the lowest energy
(1) Gauche form
(2) Eclipsed form
(3)
27.
The process of separation of racemic modification into d- and l-enantiomers is called
(1) Resolution
(2) Dehydration
(3) Revolution
(4) Dehydrohalogenation
28.
Find the non-staggered form(s) of ethane -
H
H
H
H
(1)
(2)
H
29.
H
H
H
H
H
H
(3)
H
H
H
(4)
H
H
H
None
H
Methylpropyl thioether and isopropyl methyl thioether are
(1) Metamers
(2) Position isomers (3) Chain isomers
(4) Chain and position both
30.
The
(1)
(2)
(3)
(4)
enolic form of acetaldehyde contains
6 Sigma bonds, 1 pi bond and 2 lone pairs
8 sigma bonds, 2 pi bonds and 2 lone pairs
10 sigma bonds, 1 pi bonds and 1 lone pair
9 sigma bonds, 2 pi bond and 1 lone pair
31.
Possible number of disubstituted benzene isomers is –
(a) 1
(2) 2
(3) 3
32.
Which type of isomerism is mutually shown by the following structures
(4)
4
Cl
CH3 — CH — CH2 — CH2 — CH3
(1)
(3)
CH3 — CH2 — C — CH3
Cl
Only functional group isomerism
Positional and chain isomerism
(2)
(4)
CH3
Only chain isomerism
Only positional isomerism
33.
What should be the minimum number of carbon atoms present in an ether to exhibit chain
isomerism
(1) 2
(2) 3
(3) 4
(4) 5
34.
Which of the following is not a functional group isomer of ethyl acetate (1) Isobutyric acid
(2) 2, 3-Butanediol
(3) 3-Hydroxybutanal (4) 4-Hydroxybutanone
35.
Which of the following can be regarded as an enolic form of acetone
(1) Propanal
(2) 2-Propene-1-ol (3) 1-Propen-1-ol
(4)
36.
How many carbon atoms are present in lowest possible alkane which can exhibit
enantiomerism
(1) 5
(2) 6
(3) 8
(4) 7
2
Isopropenyl alcohol
Chemrock
SUB. CHEMISTRY
DPP No. -
TOPIC ISOMERISM
37.
A compound whose molecule is superimposable on its mirror image inspite of the presence of
chiral centres is called
(a) Diastereomer
(2) Meso compound (3) An enantiomer (4) A threo enantiomer
38.
Among the following structure which one is called erythro isomer
B
(A)
(1)
39.
The
(1)
(2)
(3)
(4)
B
A
X
A
X
(B)
Y
(A) and (B)
(2)
B
A
X
X
A
Y
Only (B)
(C)
(3)
pair of structure given below represent
Enantiomers
Conformers
H
Position isomers
Homologues
Br
(1)
H3C
C
41.
42.
43.
H
H
H
H
H
H
Me
Cl
CH2CH5
CC
CH3
C HO
H
CHCl2
(4)
CC
Cl
H
Only (C)
and
CH  CH2
(3)
Y
(4)
H
CH2CH3
H3C
A
H
(2)
CC
X
Me
Which of the following represent E isomer :
Cl
B
Only (A)
H
40.
A
CHCl2
CH3
The instrument used for measuring specific rotation is
(1) Spectrometer
(2) Polarimeter
(3) Lactometer
(4)
Ammeter
Ethyl acetoacetate exhibits which of the following isomerism
(1) Optical
(2) Geometrical
(3) Tautomerism
(4)
Enantiomerism
Examine following three pairs of possible isomers
Cℓ
CH3
Cℓ
Cℓ
CH3
(ia)
Now
(1)
(2)
(3)
(4)
(ib)
Cℓ
(iia)
CH3
COOH
CH3
(iib)
COOH
COOH
(iiia)
(iiib)
COOH
state whether the pairs represent identical compounds or different isomers
All threee pairs represent different compounds
(ia) and (ib) are identical; (iia) and (iib) are identical; and (iiia) and (iiib) are identical
(ia) and (ib) are isomers; (iia) and (iib) are identical; (iiia) and (iiib) are isomers
(ia) and (ib) are identical; (iia) and (iib) are identical; and (iiia) and (iiib) are isomers
44.
&
(1) Position isomers
45.
asdf
(1)
are called as
(2) Chain isomers
&
Chain
(3) Funcitonal isomers
(4) Ring chain isomers
Show isomerism
(2)
Position
(3)
3
Functional
(4)
None of these
Chemrock
SUB. CHEMISTRY
DPP No. -
TOPIC ISOMERISM
ANSWER KEY :
QUE.
1
2
3
4
5
6
7
8
9
10
ANS.
1
1
1
4
2
1
2
1
2
2
QUE.
11
12
13
14
15
16
17
18
19
20
ANS.
2
4
2
2
4
3
3
2
3
4
QUE.
21
22
23
24
25
26
27
28
29
30
ANS.
4
3
4
3
2
3
1
2
2
1
QUE.
31
32
33
34
35
36
37
38
39
40
ANS.
3
2
4
2
4
4
2
3
2
2
QUE.
41
42
43
44
45
ANS.
2
3
4
1
3
4