JEE Main Chemistry question

1,4-Diaminobutane (putrescine), NH_2CH_2CH_2CH_2CH_2NH_2, as its dihydrochloride, on heating, cyclises with loss of . The product formed is

(A)Pyrrolidine Correct
(B)Piperidine
(C)Morpholine
(D)Piperazine

Answer: (A)

Solution

On heating, one of the two terminal ammonium ends is released as while the other nitrogen's lone pair closes the ring intramolecularly by attack on the carbon that lost the leaving ammonium group.

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Question ID VK-150444