Question

Which of the following are not the names of$C{H_3}NC$?
A. Methyl isocyanide
B. Aceto isonitrile
C. Methyl carbylamine
D. Acetonitrile

Answer 1

The functional group representing $-NC$ corresponds to the isocyanide. Here the residual part of the compound is attached to the nitrogen atom of the functional group and not carbon atom. They are similar to cyanides $-CN$ but differ in connectivity.

Complete step by step answer: The given compound $C{H_3}NC$ is an organic compound where a methyl group is attached to an isocyanide group. Isocyanides are a class of organic compounds in which an alkyl or aryl group is bonded to nitrogen atom which is bonded to carbon atom through triple bond.
Let us consider the given names one by one to evaluate the structure of$C{H_3}NC$.
Methyl isocyanide is a compound in which a methyl group is attached to an isocyanide group. A methyl group is shown as $C{H_3} -$ and isocyanide as$-NC$. Thus it is the correct name of$C{H_3}NC$.
Aceto isonitrile is a compound in which the aceto group is attached to isonitrile group. The aceto group is the compound in which the methyl group is attached to carbonyl group i.e. $C{H_3} - CO$. Thus when this is attached to isonitrile the compound is different from$C{H_3}NC$.
Methyl carbylamine is a compound in which the methyl group is attached to the carbylamine group. Carbylamine is a synonym of isocyanide. The name carbylamine originated from a test of primary amine$RN{H_2}$. When primary amine reacts with $CHC{l_3}$ in presence of$NaOH$, the product generated is $C{H_3}NC$. The unpleasant smell of the product confirms the formation of isocyanides.
Acetonitrile is a compound also known as methyl cyanide. Here the methyl group is attached to a nitrile group. So the compound obtained is $C{H_3}CN$ and not$C{H_3}NC$.
Hence option B and D are correct. The name Aceto isonitrile and Acetonitrile are not the correct name of$C{H_3}NC$.

Note: The isocyanides or isonitriles are related to cyanides or nitriles. The unpleasant smell of isocyanides is an important characteristic of this class of compounds. The isocyanides are resonance stabilized compounds. The resonance can be shown as