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Organic Chemistry Multiple Choice Questions and Answers – Alkanes

Free download in PDF Organic Chemistry Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>

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(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
(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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