Question

Aryl halides doesn't undergo nucleophilic substitution reactions under ordinary conditions because of 1. approach of nucleophile is retarded 2. carbon carrying halogen atoms is $sp^3$ - hybridised 3. the substrate molecule is destabilised due to resonance 4. partial double bond character between carbon and halogen

• A. $2$ and $4$ only
• B. $1$ and $4$ only
• C. $2$ and $3$ only
• D. $2, 3$ and $4$ only

Answer 1

Answer: (B)

$1$ and $4$ only

Answer 2

Because of the + R effect of halogen atom, $CX$ bond of aryl halide has some double bond character, hence it is inert towards nucleophile and approach of nucleophile is retarded.