In the reaction {CH}₃ {NH}₂ + {CHCl}₃ + {KOH} [X] + {KCl} + {H}₂{O} the compound (X) is

Correct Answer is : CH3N+≡C−{CH}₃ {+}{{N}} {C}^{-}CH3N+≡C−

In the reaction {CH}₃ {NH}₂ + {CHCl}₃ + {KOH} [X] + {KCl} + {H}₂{O} the compound (X) is

Correct Answer is : CH3N+≡C−{CH}₃ {+}{{N}} {C}^{-}CH3N+≡C−

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CGPET 2018 Solved Paper

Section: Chemistry

Question : 57 of 150

Marks: +1, -0

In the reaction

\mathrm{CH}_3 \mathrm{NH}_2 + \mathrm{CHCl}_3 + \mathrm{KOH} \longrightarrow

[X] + \mathrm{KCl} + \mathrm{H}_2\mathrm{O}

the compound

(X)

$\mathrm{CH}_3 \overset{+}{\mathrm{N}} \equiv \mathrm{C}^{-}$
$\mathrm{CH}_3-\mathrm{NH}-\mathrm{CH}_3$
$\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{N}$
$\mathrm{CH}_3-\overset{+}{\mathrm{N}} \equiv \mathrm{C}^{-}$

Validate

Solution:

When a primary amine like methylamine

(\mathrm{CH}_3 \mathrm{NH}_2)

react with chloroform

(\mathrm{CHCl}_3)

in the presence of KOH, it will form iso-cyanide having same number of carbon atoms, as in alkyl group of amine. i.e. methyl amine. This reaction is known as carbylamine reaction.

\underset{\text{Methylamine}}{\mathrm{CH}_3\mathrm{NH}_2} + \mathrm{CHCl}_3 + 3\mathrm{KOH} \longrightarrow

\underset{\text{Methyl isocyanide}}{\mathrm{CH_3-NC} + 3\mathrm{KCl} + 3\mathrm{H}_2\mathrm{O}}

Hence,

(

a) is the correct option.

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