Nitrogen Containing CompoundMedium
Question
Consider the three aromatic molecules ( $P,Q$ and R ) whose structures have been given below :
The correct order regarding the reactivity of these compounds with $Ph - N \equiv N{Cl}^{( - )}$under optimum but (+) slightly acidic medium is :
Options
A.P $>$ Q $>$ R
B.$R > P > Q$
C.$R > Q > P$
D.$P > R > Q$
Solution
Sol. [Key Concept: Diazonium-coupling rate $\propto$ ring nucleophilicity; steric twisting of $- {NMe}_{2}$ lowers it.]
Rate of ESR $\propto$ nucleophilicity of benzene ring.
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