Hydrocarbons (Alkanes) #1

The following compounds are alkanes EXCEPT...

• C₅H₁₂

• C₆H₁₂

• C₇H₈

• C₇H₁₄

Choose the true statement about an alkane.

• It undergoes electrophilic addition with chlorine gas.

• It undergoes nucleophilic substitution with chlorine gas.

• It undergoes homolytic cleavage when reacts with chlorine gas.

• It undergoes electrophilic substitution with an aqueous chlorine solution.

Which of the following reaction is a free radical substitution?

• Hydrolysis of alkanes.

• Combustion of alkanes.

• Halogenation of alkanes.

• Hydrogenation of alkanes.

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

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

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

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

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

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

• 
• 
• 
• 

Combustion of alkanes may produce...

• water

• carbon dioxide

• carbon monoxide

Answer explanation

Carbon monoxide is produced when the combustion is incomplete. Whereas, carbon dioxide is produced by a complete combustion.

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

• It is not polar.

• It undergoes substitution with chlorine.

• It reacts faster with bromine than chlorine.

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

• hexane

• 2,2-dimethylbutane

• 2,3-dimethylbutane