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Hydrocarbons (Alkanes) #1

Total questions: 8

Worksheet time: 2hrs 0mins

Name
Class
Date
1.

The following compounds are alkanes EXCEPT...

a)

C5H12

b)

C6H12

c)

C7H8

d)

C7H14

2.

Choose the true statement about an alkane.

a)

It undergoes electrophilic addition with chlorine gas.

b)

It undergoes nucleophilic substitution with chlorine gas.

c)

It undergoes homolytic cleavage when reacts with chlorine gas.

d)

It undergoes electrophilic substitution with an aqueous chlorine solution.

3.

Which of the following reaction is a free radical substitution?

a)

Hydrolysis of alkanes.

b)

Combustion of alkanes.

c)

Halogenation of alkanes.

d)

Hydrogenation of alkanes.

4.

Ethane and bromine react in the presence of sunlight but not in the dark. Sunlight is needed to initiate...

a)

...the heterolytic fission of C-H bonds to form carbanion.

b)

...the homolytic fission of C-H bonds in ethane molecule.

c)

...the homolytic fission of Br-Br bonds in bromine molecule.

d)

...the heterolytic fission of bromine molecule to form bromide ions.

5.

Which of the following is a propagation step in the reaction between ethane and chlorine...

a)
b)
c)
d)
6.

Combustion of alkanes may produce...

a)

water

b)

carbon dioxide

c)

carbon monoxide

7.

Which of the following is/are true about the C-H bond in alkane?

a)

It is not polar.

b)

It undergoes substitution with chlorine.

c)

It reacts faster with bromine than chlorine.

8.

Which of the compound(s) below give(s) 3 monobromoalkanes when reacted with bromine in the presence of light?

a)

hexane

b)

2,2-dimethylbutane

c)

2,3-dimethylbutane