NEETChemistryAmines
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Reduction of methyl isocyanide with LiAlH ₄ yields a secondary amine, whereas reduction of ethanenitrile yields a primary amine. Reason (R): In methyl isocyanide, the carbon atom of the isocyano group is directly attached to the methyl group. In the light of the above statements, choose the most ap
Options
- ABoth Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
- BBoth Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).
- CAssertion (A) is true but Reason (R) is false.
- DAssertion (A) is false but Reason (R) is true.
Correct answer
C. Assertion (A) is true but Reason (R) is false.
Step-by-step solution
Assertion (A) is true: Reduction of methyl isocyanide ( CH ₃ NC ) with LiAlH ₄ yields N-methylmethanamine ( CH ₃ NHCH ₃ ), which is a secondary amine. Reduction of ethanenitrile ( CH ₃ CN ) yields ethanamine ( CH ₃ CH ₂ NH ₂ ), which is a primary amine. Reason (R) is false: In isocyanides ( R-NC ), the nitrogen atom is directly bonded to the alkyl group, not the carbon atom. The carbon atom is at the terminal position. Because the nitrogen is bonded to two carbon atoms (the alkyl carbon and the isocyano carbon), it