Question

Which of the following alkane upon dichlorination can give only two products?
(1) Propane
(2) Methane
(3) Neo-pentane
(4) Cyclohexane

Answer 1

Answer:

Explanation:

The answer is Option (3).

On dichlorination, (1) Propane will yield four products a) 1,2-dichloro propane b) 1,1-dichloro propane c) 2,2-dichloro propane d) 1,3-dichloro propane.

(2) Methane will yield ony one product i.e., dichloromethane.

(3) Neopentane will yield only two products a) 1,3-dichloro-2,2-dimethyl propane b) 1,1-dichloro-2,2-dimethyl propane.

(4) Cyclohexane will yield four products a) 1,1-dichloro cyclo hexane b) 1,2-dichloro cyclo hexane c) 1,3-dichloro cyclo hexane d) 1,4-dichloro cyclo hexane.

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Answer 2

Explanation:

methane form only one product

propane form 4 product

cyclohexane form 4 product