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When an optically active amine (A) havin...

When an optically active amine (A) having molecular formula `C_4H_11N` is subjected to Hofmann's exhaustive methylation followed by hydrolysis, an alkene (B) is produced which upon oxonolysis and subsequent ydrolysis yields formaldehyde and proanal. The amine 'A' is

A

`CH_(3)-underset(NH_(2))underset("| ")"CH"CH_(2)CH_(3)`

B

`CH_(3)NH-underset(CH_(3))underset("| ")"CH"-CH_(3)`

C

`CH_(3)-underset(CH_(3))underset("| ")"NC"H_(2)CH_(3)`

D

`CH_(3)CH_(2)CH_(2)CH_(2)NH_(2)`

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The correct Answer is:
A
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