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Q.
How many structural isomers having $C _{3} H _{9} N$ formula will NOT give Hoffmann's isocyanide test?
Amines
Solution:
Four isomeric amines are possible having $C _{3} H _{9} N$ formula:
Hoffmann's isocyanide test is not given $2^{\circ}$ and $3^{\circ}$ amines.
Therefore, two structural isomers having $C _{3} H _{9} N$ formula will NOT give Hoffmann's isocyanide test.