Unit#9: Hydrocarbons

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1. General formula of alkynes is:

A CnH2n+2

B CnH2n

C CnH2n-2

D CnHn

2. Which bond is present in alkenes?

A Single bond only

B Triple bond

C Double bond

D Ionic bond

3. Which of the following indicates saturation?

A Presence of double bond

B Presence of triple bond

C No decolorization of bromine water

D Positive Baeyer's test

4. Hydration of alkenes produces:

A Alkanes

B Alcohols

C Ketones

D Aldehydes

5. Commercial name of ethyne is:

A Natural gas

B Biogas

C Acetylene

D Propylene

6. Fossil fuels are formed from:

A Recent plants

B Volcanic activity

C Dead plants and animals

D Atmospheric gases

7. In bromine water test, alkenes cause:

A Formation of precipitate

B No change

C Decolorization

D Gas evolution

8. Petroleum refining is done by the process of:

A Cracking

B Fractional distillation

C Hydrogenation

D Polymerization

9. Which hydrocarbon gives sooty flame on burning?

A Alkane

B Alkene

C Alkyne

D Both B and C

10. Which of the following is an unsaturated hydrocarbon?

A Methane

B Ethane

C Propene

D Butane

Unit#9: Hydrocarbons

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