When [CH_3CH_2CH_2- + N (CH_3)_2-CH_2CH_3 ]OH^ - (N,N-dimethyl-N-ethylpropylammonium hydroxide) is heated, then:

JEE Main Chemistry question

When

(N,N-dimethyl-N-ethylpropylammonium hydroxide) is heated, then:

(A)Propene is the major product
(B)Ethene and are the only products
(C)Ethene and propene are obtained, with ethene as the major productCorrect
(D)Equimolar amounts of ethene and propene are obtained

Answer: (C)

Solution

Hofmann elimination removes the most accessible (least hindered) -hydrogen, giving the least-substituted alkene as the major product. Of the two possible eliminations here — from the ethyl group (giving unsubstituted ethene) or from the propyl group (giving mono-substituted propene) —

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Question ID VK-150323