Baroda High School- Alkapuri
Smitamam
DPP NO. - 12
SUB. CHEMISTRY
TOPIC ISOMERISM
: EXERCISE :
1.
Which organic structure among the following is not isomer of the compound
CH3-CO-CH2CH2CH2CH3 ?
(a) CH3CH2OCH = CHCH2CH3
(b) CH3CH = CHCH2CH2CHO
(c) (CH3)CH-CO-CH2CH3
(d) CH3CH2COCH2CH2CH3
2.
The least number of carbon atoms in alkane showing isomerism is
(a) 3
(2) 1
(c) 2
(d)
4
The number of possible alkynes with molecular formula C5H8 is
(a) 2
(b) 3
(c) 4
(d)
5
The total number of isomers for C4H8 is
(a) 5
(b) 6
(d)
8
3.
4.
(c)
7
5.
The number of possible open chain (acyclic) isomeric compounds for molecular formula C5H10
would be
(a) 8
(b) 7
(c) 6
(d) 5
6.
Which of the following compounds will show metamerism ?
(a) CH3-CO-C2H5
(b) C2H5-S-C2H5
(c) CH3-O-CH3
7.
(d)
The number ether metamers represented by the formula C4H10O is
(a) 4
(b) 3
(c) 2
(d)
CH3-O-C2H5
1
8.
A compounds with molecular formula, C7H16 shows optical isomerism, the compound will bw
(a) 2, 3-dimethylpentane
(b) 2, 2-dimethylpentane
(c) 2-dimethylhexane
(d) none of these
9.
Which are isomers ?
(a) ethyl alcohol and dimethyl ether
(c) propionic acid and propanone
(b)
(d)
acetone and acetadehyde
methyl alcohol and dimethyl ether
10.
Methoxyethane and propanol are the examples of isomerism of the type
(a) structural
(b) position
(c) functional
(d) tautomerism
11.
The number of priamry amines of formula C=H11N is
(a) 1
(b) 2
(c) 3
(d)
4
The number of isomers possible for C7H8O is
(a) 2
(b) 3
(c)
(d)
5
12.
4
13.
The toal number of isomeric alcohols with the molecular formula C4H9OH is
(a) 2
(b) 3
(c) 4
(d) 5
14.
The number of possible acyclic structural isomers of C 4H10O is
(a) 5
(b) 6
(c) 7
(d)
8
15.
A similarity between optical and geometrical isomerism is that
(a) each forms equal number of isomers for a given compound
(b) If in a compound, one is present then so is the other
(c) both are included in stereoisomerism
(d) they have no similarity
16.
Which of the following compounds will exhibit geometrical isomerism ?
(a) 1- pineryl-2-butene
(b) 3- pineryl-1-butene
(c) 2- pineryl-1-butene
(d) 1, 1- diphenyl-2-propene
17.
Which of the following shows geometrical isomerism ?
(a) but-2-ene
(b) propene
(c) 2-methylbut-2-ene
(d)
o-xylene
Which of the following will show geometrical isomerism ?
(a) 1-butene
(b) 1, 2-dibromobutene (c) prppene
(d)
isopropylene
18.
1
Baroda High School- Alkapuri
Smitamam
SUB. CHEMISTRY
DPP NO. - 12
TOPIC ISOMERISM
19.
Which of the following does not show geometrical isomerism ?
(a) 1, 2-dichloro -1-pentene
(b) 1, 3-dichloro -2-pentene
(c) 1, 1-dichloro -1-pentene
(d) 1, 4-dichloro -2-pentene
20.
But-2-ene exhibits cis-trans-isomerism due to
(a) rotation around C3 – C4 sigma bond
(b)
(c) rotation around C1 – C2 bond
(d)
restricted rotation around C = C bond
rotation around C2 – C3 double bond
21.
The number of isomers for the compound with molecular formula C2BrClFi is
(a) 3
(b) 4
(c) 5
(d) 6
22.
Fischer projection indicates
(a) Horizontal substituents above tha plane
(b) Vertical substituents above the plane
(c) Both horizental and vertical substituents below the plane
(d) Both horizental and vertical substituents above tha plane
23.
Optical isomerism arises from the presence of
(a) An asymmetric carbon atom
(b)
(c) A line of symmetry
(d)
A centre of symmetry
Any of the above
24.
An organic compounds will show optical isomerism if
(a) four groups attached to C atom are different
(b) three groups attached to C atom are different
(c) two groups attached to C atom are different
(d) all the groups attached to C atom are same
25.
Which of the following molecules contain asymmetric carbon atom ?
(a) CH3CHClCOOH (b) CH3CH2COOH
(c) ClCH2CH2COOH (d)
Cl2CHCOOH
26.
(+)-Mendelic acid has a specific rotation of +158. What would be the observed specific
rotation of a mixture of 25%(-)- mandelic acid and 75%(+)-mandelic acid ?
(a) +118.5
(b) -118.5
(c) -79
(d) +79
27.
Optical activity is measured by
(a) Polarimeter
(b) Refraclometer
28.
(c)
Spectrograph
Which of the following will exhibit optical isomerism ?
(a) CH3CH2COOH
(b) CH3CHOHCOOH (c) CH3CHOHHCH3
29.
Which one of the following compounds is not optically active ?
(a) CH3CH2CH(CH3)CH2Cl
(b) CH2CH2CH(CH3)2
(c) Ch3-CHOH-COOH
(d) CH3-CHCl-CH2Br
30.
An optically active compound is
(a) 1-bromobutane
(c) 20bromo-2-methylpropane
31.
(b)
(d)
The following two compounds are
H
H
CH3
OH
OH
OH
OH
(a)
enentoimers
(b)
diastereomers
2
(c)
Tracer technique
(d)
CH3CH2CH2OH
-bromobutyric acid
1-bromo-2-methylpropane
CH
3
C2H5
C2H5
(d)
identical
H
H
are
(d)
epimers
Baroda High School- Alkapuri
Smitamam
SUB. CHEMISTRY
DPP NO. - 12
32.
TOPIC ISOMERISM
The two compounds shoen in the figure below a
O
O
or
(a)
33.
34.
diastereomers
(b)
enentiomers
(c)
epimers
(d)
regiomers
Which of the following is optically active ?
(a) Oxalic acid
(b) Ethylene glycol (c)
Glycerol
(d)
Tartaric acid
(d)
5
How many stereoisomers are possible for tartaric acid ?
(a)2
(b) 3
(c) 4
35.
meso- Tattaric acid is optically inactive due to the presence of
(a) Molecular symmetry
(b) Molecular asymmetry
(c) External compensation
(d) Two asymmetric carbon atoms
36.
The number of enantiomers of the compound CH3CHBrCHBrCOOH is
(a) 0
(b) 1
(c) 3
(d)
37.
Which of the following has a chiral carbon ?
(a) 2, 3-dimethylpentane
(b)
(c) (CH3)3CCH2CH2CH3
(d)
4
CH3-CH2-CH2-CHO
(CH3)2CHCH2CH2CH2CH3
38.
An organic compound C4H8O, is found to be optically active. Which of the following could it be ?
(a) CH3-CO-CH2-CH3
(b) CH3-CH2-CH2-CHO
(c) (CH3)2CH-CHO
(d) CH2=CH-CH(OH)-CH3
39.
Number of stereoisomers of the compound, 2- chloro-4-methylhex-2-ene is/are
(a) 1
(b) 2
(c) 4
(d) 6
40.
The number of stereoiomers for pent-3-3n-2-ol is
(a) 2
(b) 4
(c) 3
(d)
5
41.
The process of seperation of a racemic modification into d – and l- enantiomers is called
(a) Resolution
(b) Dehydration
(c) revolution
(d) Dehydrohalogenation
42.
An important chemical method is resolcve a racemic mixture makes use of the formation of
(a) a meso compound
(b) enantiomers
(c) diasteromers
(d) racemates
43.
Which one of the following is the stablest structure of cyclohexatriene ?
(a) Chair form
(b) Boat form
(c) Half chair form (d) Planar form
44.
The isomers which can be converted into another form by rotation of the molecule around
single bond are
(a) geometrical isomers
(b) conformers
(c) enentiomers
(d) diasteremers
45.
The most stable conformation of n-butane is
(a) skew-boat
(b) eclipsed
(c)
46.
gauche
Consider the following statement(s) is(are) correce ?
I
monosubstituted alkene
II.
dissubstituted alkene
III. trisubstituted alkene
Which of the following statement(s) is(are) correct ?
(a) I,II and III
(b) I and II
(c) II and III
3
(d) staggered-anti
(d) I and II
Baroda High School- Alkapuri
Smitamam
SUB. CHEMISTRY
DPP NO. - 12
47.
48.
49.
50.
TOPIC ISOMERISM
How many cyclic isomers of C5H10 are possible ?
(a) 4
(b) 3
(c)
2
How many isomers can C5H12 have ?
(a) 3
(b) 2
(c)
4
The compound C4H10O can show
(a) metamerism
(c) position isomerism
(b)
(d)
functional isomerism
all types
An isomer of propanal is
(a) acetone
(b)
(c)
ethanol
propane
(d) 5
(d)
(d)
5
propanol
ANSWER KEY :
QUE.
1
2
3
4
5
6
7
8
9
10
ANS.
B
D
B
B
C
B
B
A
A
C
QUE.
11
12
13
14
15
16
17
18
19
20
ANS.
D
D
C
C
C
A
A
B
C
B
QUE.
21
22
23
24
25
26
27
28
29
30
ANS.
D
A
A
A
A
D
A
B
B
B
QUE.
31
32
33
34
35
36
37
38
39
40
ANS.
A
A
D
B
A
D
A
D
C
B
QUE.
41
42
43
44
45
46
47
48
49
50
ANS.
A
C
D
B
D
A
D
A
D
A
4