question_answer

Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as

Assertion: Alkyl isocyanides in acidified water give alkyl form amides. Reason: In isocyanides, carbon first acts as a nucleophile and then as an electrophile.

A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

C) If Assertion is true but Reason is false.

D) If both Assertion and Reason are false.

Correct Answer: A

Solution :

In an isocyanide, first an electrophile and then a nucleophile is added to the carbon to form a species which undergoes further transformation \[R-\overset{+}{\mathop{N}}\,\equiv {{C}^{-}}+{{H}_{2}}O\xrightarrow{{}}RN=\underset{\begin{smallmatrix}  RNHCHO \\  alkylformamide \end{smallmatrix}}{\mathop{\underset{\downarrow }{\mathop{CHOH}}\,}}\,\]