Isomerism

1

The number of structural isomeric alcohols of the molecular formula
C₄ H₁₀ O are:

a) 4

b) 3

c) 2

d) 16

2

Which of the following is a chain isomer of 2,2-Dimethylpropane?

a) 2-Methylpentane

b) Pentane

c) 2,3-Dimethylbutane

d) all of them

3

Which one of the following are functional isomers of 1-Butanol?

a) Methoxypropane

b) Ethoxyethane

c) 2-Butanol

d) both a and b

4

Which one of the following are not a pair of positional isomers?

a) 2-Pentene and 1-Pentene

b) 5-Chloro-1-pentene & 5-Chloro-2-pentene

c) 2-Chloropentane & 3-Chloropentane

d) 3-Chloropentane & 2-Chlorohexane

5

2-Butanol and Ethoxyethane are a pair of:

a) positional isomers

b) chain isomers

c) functional isomers

d)stereoisomers

6

How many constitutional isomers are possible with the molecular formula C₃H₅ Br₃?

a) 6)

b) 4

c) 5

d) 8

7

How many positional isomers are possible for trimethyl benzene?

a) 2)

b) 3

c) 4

d) 5

8

The number of chain isomers of a hydrocarbon with molecular formula C₅H₁₂ are 3, what will be the number for C₇ H₁₆?

a) 5

b) 8

c) 7

d) more than 8

9

The number of structural isomers formed on mono-chlorination of 2-Methylbutane are:

a) 2)

b) 3

c) 4

d) 5

10

1-Butanol is not a structural isomer of:

a) 2-Butanol

b) 2-Methyl-2-propanol

c) 2-Methylpropanol

d) Cyclobutanol

11

Isomers which are a result of free rotation of carbon-carbon bond axis are:

a) Positional isomers

b) chain isomers

c) functional isomers

d) conformational isomers

12

Metamerism is another type of structural isomers, they ave the same molecular formula, the same functional group but different carbon frame work.Which of the following are a pair of metamers?

13

Structural isomers( Constitutional isomers) have the same molecular formula but different:

a) carbon chain

b) functional groups

c) structure

d) all of them

14

The compounds CH₃CH=CHCH₃ and CH₃CH₂CH=CH₃ are:

a) functional isomers

b) chain isomers

c) metamers

d) have the same number of sp3 and sp2 carbons

15

How many minimum number of carbon atoms are necessary in an alkane for it to exist in two chain isomeric forms?

a) 2

b) 3

c) 4

d) 5