Given below are two statements: Statement I: The dipole moment of R-CN is greater than \(\mathrm{R}-\mathrm{NC}\) and \(\mathrm{R}-\mathrm{NC}\) can undergo hydrolysis under acidic medium to produce

(D) Statement I is false but Statement II is true

(A) Both Statement I and Statement II are false

(B) Both Statement I and Statement II are true

(C) Statement I is true but Statement II is false

JEE Main · 2026 · 24 Jan 2026 · Shift 2 · Compounds Containing Nitrogen

Given below are two statements:

Statement I: The dipole moment of R-CN is greater than

R - NC

and

R - NC

can undergo hydrolysis under acidic medium to produce

(A)Both Statement I and Statement II are false
(B)Both Statement I and Statement II are true
(C)Statement I is true but Statement II is false
(D)Statement I is false but Statement II is true✓ Correct

Answer: (D)

Solution

Statement I asserts that R-CN has a larger dipole moment than R-NC and that R-NC on acidic hydrolysis gives a carboxylic acid. Both parts fail: the isocyanide R-NC actually has the larger dipole moment, and acidic hydrolysis of an isocyanide yields a primary amine with formic acid,

R - N C + 2 H_{2} O H^{+} R N H_{2} + H C O O H

, not the carboxylic acid drawn, so Statement I is false. Statement II traces the conversion of R-CN to R-NC through

R C O O H \to R C O C l \to R C O N H_{2} \to R N H_{2} \to R - N C

(hydrolysis, then the amide, Hofmann amine and carbylamine steps), a valid route, so Statement II is true. Statement I is false while Statement II is true.

JEE Main · 2026 · 24 Jan 2026 · Shift 2 · Single correct option

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JEE Main · 2026 · 24 Jan 2026 · Shift 2 · Compounds Containing Nitrogen

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