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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm070

Select the correct statements about nitriles and isonitriles.

A $CH X_{3} CH X_{2} CN$ is named propanenitrile.
B $CH X_{3} CN$ and $CH X_{3} NC$ are functional isomers.
C $CH X_{3} NC$ is named ethanenitrile.
DCyclohexanecarbonitrile contains 7 carbon atoms.

Answer: A, B, D

Both

CH X_{3} CN

and

CH X_{3} NC

are

C X_{2} H X_{3} N

with different functional groups (true). The CN carbon is counted in the chain, so

CH X_{3} CH X_{2} CN

is propanenitrile (true). Six ring carbons plus the nitrile carbon give 7 (true).

CH X_{3} NC

is an isonitrile, isocyanomethane; ethanenitrile is

CH X_{3} CN

(false).

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