NEETChemistryAmines
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Reduction of benzonitrile and phenyl isocyanide with LiAlH₄ yields the same primary amine. Reason (R): Benzonitrile and phenyl isocyanide are functional isomers containing the same number of carbon and nitrogen atoms. In the light of the above statements, choose the most appropriate answer from the
Options
- ABoth (A) and (R) are correct and (R) is the correct explanation of (A)
- BBoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
D. (A) is not correct but (R) is correct
Step-by-step solution
Assertion (A) is false because the reduction of benzonitrile ( C₆H₅CN ) with LiAlH₄ yields benzylamine ( C₆H₅CH₂NH₂ ), which is a primary amine, whereas the reduction of phenyl isocyanide ( C₆H₅NC ) yields N-methylaniline ( C₆H₅NHCH₃ ), which is a secondary amine. Reason (R) is true because benzonitrile and phenyl isocyanide both have the same molecular formula ( C₇H₅N ) but possess different functional groups ( -CN and -NC ), making them functional isomers. Answer: (A) is not correct but (R) is correct