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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

`CHunderset(NH_2)underset(|)CHCH_2CH_3`

B

`CH_3NH-underset(CH_3)underset(|)(CH)-CH_3`

C

`CH_3underset(CH_3)underset(|)NCH_2CH_3`

D

`CH_3CH_2CH_2CH_2NH_2`

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