Organic Chemistry Exam Questions and Answers | Organic Chemistry MCQs Quiz

Questions

1 Select the incorrect statement regarding alkanes.

A It is otherwise known as Paraffin

B It is an acyclic saturated hydrocarbon

C In alkanes, C-C bonds are single

D Alkanes have the general formula C_nH_2n

View Answer

Answer: Alkanes have the general formula C_nH_2n

2 Identify the simplest alkane.

A Methane

B Methene

C Ethane

D Ethene

View Answer

Answer: Methane

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

A 15

B 16

C 17

D 18

View Answer

Answer: 17

4 Identify the incorrect statement.

A Alkanes with repeated –CH₂– units constitute a homologus series

B They are very reactive

C They have very less biological activity

D Petroleum and natural gas are the main sources of alkanes

View Answer

Answer: They are very reactive

5 Which among the following is not an alkane isomer with 6 carbon atoms?

A Hexane

B 2,3-dimethylbutane

C 2,2-dimethylbutane

D Neopentane

View Answer

Answer: Neopentane

6 The other name for branched chain alkanes is _____________

A Paraffins

B Isoparaffins

C Neoparaffins

D Naphthenes

View Answer

Answer: Isoparaffins

7 Select the incorrect statement regarding the boiling points of alkanes.

A Boiling point increases with stronger Vander Waal’s forces

B Surface area is the only factor which determines the boiling point of alkane

C Boiling point of straight chain alkanes is greater than that of branched chain alkanes

D The boiling point of cycloalkanes is always higher than that of linear alkanes

View Answer

Answer: Surface area is the only factor which determines the boiling point of alkane

8 Choose the correct statement.

A Alkanes have poor conductivity

B They form hydrogen bonds

C They have good solubility in non polar solvents than polar solvents

D Alkanes have less density than that of water

View Answer

Answer: They form hydrogen bonds

9 Liquified petroleum gas is mainly composed of _____________

A Methane and ethane

B Ethane and propane

C Propane and butane

D Butane and hexane

View Answer

Answer: Propane and butane

10 An alkane with 6 carbon atoms will have how many hydrogen atoms?

A 11

B 12

C 13

D 14

View Answer

Answer: 14

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