How many primary amines are there among the constitutional isomers of $C X_{4} H X_{11} N$ (all of which are saturated acyclic amines)? Each of them gives the carbylamine test. Count constitutional isomers only (no stereoisomers).

Answer: B

A primary amine is

R - NH X_{2}

with R =

C X_{4} H X_{9}

, and there are four butyl groups (n-butyl, sec-butyl, isobutyl, tert-butyl). So butan-1-amine, butan-2-amine, 2-methylpropan-1-amine and 2-methylpropan-2-amine give 4. The other 4 isomers are secondary (3) or tertiary (1), giving 8 in all.

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How many primary amines are there among the constitutional isomers of CX4​HX11​N (all of which are saturated acyclic amines)? Each of them gives the carbylamine test. Count constitutional isomers only (no stereoisomers).

Answer: B

More questions on Structure determination from reaction sequences

How many primary amines are there among the constitutional isomers of $C X_{4} H X_{11} N$ (all of which are saturated acyclic amines)? Each of them gives the carbylamine test. Count constitutional isomers only (no stereoisomers).