Question

Which of the following reactions will not give a primary amine as the product?

Options

• \[\ce{CH3CN ->[(i) LiAlH4][(ii) H3O^\oplus] Product}\]

• \[\ce{CH3NC ->[(i) LiAlH4][(ii) H3O^\oplus] Product}\]

• \[\ce{CH3CONH2 ->[(i) LiAlH4][(ii) H3O^\oplus] Product}\]

• \[\ce{CH3CONH2 ->[Br2/KOH] Product}\]

Answer 1

\[\ce{CH3NC ->[(i) LiAlH4][(ii) H3O^\oplus] Product}\]

Explanation:

Let us write the chemical to complete the reactions.

(i) \[\ce{CH3 - CN ->[(i) LiAlH4][(ii) H3O^\oplus] CH3 - CH2 - NH2 (1° Amine)}\] 

(ii) \[\ce{CH3NC ->[(i) LiAlH4][(ii) H3O^\oplus] CH3 - NH - CH3 (2° Amine)}\]

(iii) \[\begin{array}{cc}
\ce{O}\phantom{..............................................................}\\
||\phantom{..............................................................}\\
\ce{CH3 - C - NH2 ->[(i) LiAlH4][(ii) H3O^\oplus] CH3 - CH2 - NH2 (1° Amine)}
\end{array}\]

(iv) \[\begin{array}{cc}
\ce{O}\phantom{...................................................}\\
||\phantom{...................................................}\\
\ce{CH3 - C - NH2 ->[Br2/KOH] CH3 - NH2 (1° Amine)}
\end{array}\]