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Question

What is X in the following sequence of reactions?

C4H7OCl(X)NH3−−C4H9ONBr2/KOH−−−−−CH3CH2CH2NH2

A
(CH3)2CHCOCl
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B
CH3CH2CH(OH)CH2Cl
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C
CH3CH2CH2COCl
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D
ClCH2CH2CH2CHO
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Solution

The correct option is C CH3CH2CH2COCl
The reaction can be structurally written as,
CH3CH2CH2COCl(X)NH3−−CH3CH2CH2CONH2Br2/KOH−−−−−CH3CH2CH2NH2

Here, X=CH3CH2CH2COCl

X can be confirmed by its number of hydrogen atoms given in the molecular formula of X. And also, nitro n-propane can be obtained only from n-butanamide and this reaction is called a Hoffmann reaction. n-butanamide can be obtained only from n-butanyl chloride.
Thus, option -C is correct.

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