Alkane(General Knowledge > General Science ) Questions and answers for exam Preparation

Question 1. The other name for branched chain alkanes is _____________

Paraffins
Isoparaffins
Neoparaffins
Naphthenes

Explanation:-

Answer: Option B. -> Isoparaffins

Question 2. Which among the following is not an alkane isomer with 6 carbon atoms?

Hexane
2,2-dimethylbutane
2,3-dimethylbutane
Neopentane

Explanation:-

Answer: Option D. -> Neopentane

Question 3. Identify the incorrect statement

They are very reactive
They have very less biological activity
Petroleum and natural gas are the main sources of alkanes
Alkanes with repeated –CH2– units constitute a homologus series

Explanation:-

Answer: Option A. -> They are very reactive

Question 4. Select the incorrect statement regarding alkanes

It is an acyclic saturated hydrocarbon
It is otherwise known as Paraffin
In alkanes, C-C bonds are single
Alkanes have the general formula CnH2n

Explanation:-

Answer: Option D. -> Alkanes have the general formula CnH2n

Question 5. Identify the simplest alkane

Methane
Ethane
both a and b
none of these

Explanation:-

Answer: Option A. -> Methane

Question 6. Select the minimum number of carbon atoms, a molecule must possess so as to be regarded as a higher alkane

15
16
17
18

Explanation:-

Answer: Option C. -> 17

Question 7. The general formula of alkane is-

CnH 2n+2
CnH2n
CnH2n-2
C2H2

Explanation:-

Answer: Option A. -> CnH 2n+2

Question 8. Which of the following is the most volatile compound?

n-pentane
Isobutane
2-methyl butane
2, 2-dimethyl propane

Explanation:-

Answer: Option D. -> 2, 2-dimethyl propane

Question 9. Alkanes undergo halogenation

elimination
nucleophilic substitution
free-radical substitution
electrophilic substitution

Explanation:-

Answer: Option C. -> free-radical substitution

Question 10. If an alkane has 20 carbon atoms, how many hydrogen atoms will it have?

20
22
40
42

Explanation:-

Answer: Option D. -> 42