Assertion : Alkyl isocyanides in acidified water give alkyl formamides. Reason : In isocyanides, carbon…
Assertion : Alkyl isocyanides in acidified water give alkyl formamides.
Reason : In isocyanides, carbon first acts as a nucleophile and then as an electrophile.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false
If both assertion and reason are false.
Solution
In an isocyanide, first an electrophile and then a nucleophile add at the carbon to form a species which usually undergoes further transformations.
$\begin{array}{r}
R \stackrel{+}{\mathrm{N}} \equiv \overline{\mathrm{C}}+E^{+} \longrightarrow R \stackrel{+}{\mathrm{N}} \equiv \mathrm{CE} \stackrel{\mathrm{Nu}}{\longrightarrow} \mathrm{RN}=\mathrm{C}(\mathrm{Nu}) E \\
R_{+}^{\mathrm{N}} \equiv \overline{\mathrm{C}}+\mathrm{H}_2 \mathrm{O} \longrightarrow R \mathrm{~N}=\mathrm{CHOH} \longrightarrow \underset{\text{alkyl formamide}}{R \mathrm{NHCHO}}
\end{array}$