Q 1.
Q 2.
Q 3.
Q 4.
Isomers have essentially identical :
(a) structural formula
(c) physical properties
The isomerism observed in alkanes is :
(a) metamerism (b) chain isomerism
(b) chemical properties
(d) molecular formula
(c) position isomerism
(d) geometrical isomerism
Total number of isomeric alcohols with formula C4H10O are :
(a) 1
(b) 2
(c) 3
(d) 4
An alkane forms isomers if minimum number of C-atom is :
(a) 1
(b) 2
(c) 3
(d) 4
Q 5.
The molecular formula of a saturated compound is C2H4Cl2. The formula permits the existence of two:
(a) functional isomers
(b) position isomers
(c) optical isomers
(d) cis-trans isomers
Q 6.
Which of the following pairs show isomerism ?
(a) CH4 and C2H6
(b) CHCl3 and CCl4
(c) CH3CH2OH and CH3OCH3
(d) NaCl and NaOH
Q 7.
Which of the following is not isomeric with diethyl ether ?
(a) Methyl n-propyl ether
(b) Butan-1-o1
(c) 2-methyl propan-2-o1
(d) Butan-2-one
Q 8.
Compounds with following formula will show:
(a) position and functional isomerism
(c) chain and functional isomerism
Q 9.
Q 10.
Q 11.
Q 12.
(b) chain and positional isomerism
(d) none of the above combinations
Which of the following are functional isomers?
(a) CH3CH2Cl and CH3CH2Br
(b) CH3CHBr2 and CH2Br. CH2Br
(c) C2H5OC2H5 and CH3OC3H7
(d) CH3CH2CHO and
But-1-ene and cyclobutane exhibit:
(a) ring chain isomerism
(c) tautomerism
(b) position isomerism
(d) functional isomerism
Which pair of carbon skeleton is an example of isomerism?
(a)
(b)
(c)
(d)
Which of the following is not an isomer of but-1-yne ?
(a) but-2-yne
(c) methyl cyclopropene
Q 13.
Q 14.
(b) buta-1-3-diene
(d) but-2-ene
C7H8O show how many isomers:
(a) 2
(b) 3
(c) 4
(d) 5
The isomers of formula C2H2Br2 are:
(a) 4
(b) 3
(c) 6
(d) 2
Q 15.
Maximum number of Isomers that an alkene can have with the molecular formula C4H8 is:
(a) 5
(b) 4
(c) 3
(d) 2
Q 16.
Which of the following isomerism is not found in alkenes?
(a) Metamerism
(b) Geometrical isomerism
(c) Position isomerism
(d) Chain isomerism
Q 17.
The type of isomerism found in urea molecule is:
(a) chain
(b) position
(c) tautomerism (d) none of these
Q 18.
The compounds R—NO2 and R—ONO are :
(a) geometrical isomers
(b) functional isomers
(c) metamers
(d) optical isomers
Q 19.
Only 2 monochloroderivatives (isomeric) are possible for :
(a) n-butane
(b) 2, 4-dimethyl pentane
(c) benzene
(d) none of these
Q 20.
Molecular formula C5H12O will show:
(a) position
(c) functional isomerism
Q 21.
(b) optical isomerism
(d) all of these
Which among the following will not show chain isomerism ?
(a) C3H8
(b) C4H10
(c) C5H12O
(d) C5H10O
Q 22.
Which pair of isomerism is not possible together?
(a) Chain and position
(b) Functional and position
(c) Tautomerism and functional
(d) All of the above
Q 23.
Consider the following statements:
1. Chain and position isomerism are not possible together between two isomers
2. Tautomerism is a chemical phenomenon which is catalysed by acid as well as base
3. Tautomers are always metamers
4. Tautomers are always functional isomers
Select the correct answer by using the codes given below:
(a) only 3 is correct
(b) 3 and 4 are correct
(c) 1, 2 and 4 are correct
(d) 1, 2 and 3 are correct
Stereoisomers have different :
(a) molecular formula
(b) structural formula
(c) configuration
(d) molecular mass
Q 24.
Q 25.
Which of. the following compounds can show optical isomerism?
(a) CH3CH2OH
(b) CH2OHCHOHCH2OH
(c) CH3CHOHC2H5
(d) CCl2F2
Q 26.
A compound contains 2 dissimilar asymmetric C-atoms. The number of optical isomers are:
(a) 2
(b) 3
(c) 4
(d) 5
Q 27.
The optical isomerism is shown by :
(a) oxalic acid
(b) benzoic acid (c) acetic acid
Q 28.
Chiral molecules are those which are:
(a) superimposable on their mirror images
(b) non-superimposable on their mirror images
(c) unstable molecules
(d) capable of showing geometrical isomerism
Q 29.
Which of the following has asymmetric C-atom :
Q 30.
(a)
(b)
(c)
(d)
(d) lactic acid
+ and - forms of optically active compounds are different in:
(a) boiling points
(b) melting points
(c) specific gravity
(d) specific rotation
Q 31.
The functional groups —OH, —COOH, —CHO, —OCH3 attached to a chiral carbon is in the
preference order :
(a) OH>COOH>CHO>OCH3
(b) OCH3>OH>CHO>COOH
(c)OCH3>OH>COOH>CHO
(d) OCH3 > COOH > CHO> OH
Q 32.
Which of the following have asymmetric carbon atoms?
(a) CH2ClCH2Br (b) CH3CHCl2
(c) CHCl2CHBr2 (d) CH2BrCHOHCH3
Q 33.
An organic molecule necessarily shows optical activity if it :
(a) contains asymmetric carbon atoms
(b) is non-planar
(c) is non-superimposable on it’s mirror image
(d) is superimposable on its mirror image
Q 34.
The property by virtue of which a compound can rotate the plane of polarised light is known as:
(a) Polarisability (b) Phosphorescense
(c) Optical activity
(d) Polarization
Q 35.
The heat of hydrogenation of benzene is 51 kcal/mol and its resonance energy is 36 kcal/mol. Then,
the heats of hydrogenation of cyclohexadiene and cyclohexene are respectively:
(a) 58 kcal, 58 kcal
(b) 29 kcal, 29 kcal
(c) 29 kcal, 58 kcal
(d) 58 kcal, 29 kcal
Answers
1.
8.
15.
22.
29.
d
b
b
c
d
2.
9.
16.
23.
30.
b
d
a
d
d
3.
10.
17.
24.
31.
d
a
c
c
c
4.
11.
18.
25.
32.
d
a
b
c
d
5.
12.
19.
26.
33.
b
d
a
c
c
6.
13.
20.
27.
34.
c
d
d
d
c
7.
14.
21
28
35.
d
b
c
b
d