Organic Chemistry Multiple Choice Questions and Answers – Alkanes

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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 CnH2n

Answer: Alkanes have the general formula CnH2n
2 Identify the simplest alkane.
A Methane
B Methene
C Ethane
D Ethene

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

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

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

Answer: Neopentane
6 The other name for branched chain alkanes is _____________
A Paraffins
B Isoparaffins
C Neoparaffins
D Naphthenes

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

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

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

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

Answer: 14

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