Unit#9: Hydrocarbons

1

Fossil fuels are formed from:

A Recent plants B Volcanic activity C Dead plants and animals D Atmospheric gases

2

Which test is used to detect unsaturation in hydrocarbons?

A Litmus test B Bromine water test C Flame test D Solubility test

3

Hydrogenation of alkenes converts them into:

A Alkynes B Alcohols C Alkanes D Acids

4

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

5

Which substance turns purple KMnO4 colorless?

A Alkane B Alkene C Alcohol D Salt

6

Which petroleum fraction is used as lubricating oil?

A Kerosene B Diesel C Heavy oil fraction D Refinery gas

7

Main constituent of natural gas is:

A Ethane B Methane C Propane D Butane

8

Which bond is present in alkenes?

A Single bond only B Triple bond C Double bond D Ionic bond

9

Which of the following is a fossil fuel?

A Wood B Coal C Biogas D Hydrogen

10

Ethyne is commonly used for:

A Cooking B Welding C Lighting homes D Refrigeration

11

Baeyer's test uses which chemical?

A Bromine B KMnO4 C HCl D NaOH

12

Which of the following is an unsaturated hydrocarbon?

A Methane B Ethane C Propene D Butane

13

Which petroleum fraction is used for making roads?

A Diesel B Bitumen C Petrol D Kerosene

14

In bromine water test, alkenes cause:

A Formation of precipitate B No change C Decolorization D Gas evolution

15

The lightest fraction obtained from petroleum is:

A Petrol B Diesel C Refinery gas D Fuel oil

16

Cracking of large alkanes mainly produces:

A Alcohols B Alkenes C Carboxylic acids D Esters

17

Which fraction is used as jet fuel?

A Petrol B Diesel C Kerosene D Fuel oil

18

Which hydrocarbon contains only single covalent bonds?

A Alkene B Alkyne C Alkane D Aromatic hydrocarbon

19

Which hydrocarbon gives sooty flame on burning?

A Alkane B Alkene C Alkyne D Both B and C

20

Which process converts heavy oil fractions into lighter ones?

A Hydration B Cracking C Distillation D Hydrogenation

21

Which bond is present in alkynes?

A Single bond B Double bond C Triple bond D Ionic bond

22

Hydration of alkenes produces:

A Alkanes B Alcohols C Ketones D Aldehydes

23

Alkenes react with halogens to form:

A Alkanes B Dihalogen compounds C Alcohols D Aldehydes

24

Which hydrocarbon does NOT decolorize bromine water?

A Ethene B Ethyne C Propene D Ethane

25

Which hydrocarbon has the highest degree of unsaturation?

A Alkane B Alkene C Alkyne D Cycloalkane