Explanation:
Aryl halide is less reactive than alkyl halide towards nucleophilic substitution because of the resonance stabilization and sp2 hybridization of C attached to halide.
Due to resonance, carbon-chlorine bond acquires partial double bond character, hence it becomes shorter and stronger, and thus, cannot be easily replaced by nucleophiles.
This effect is further enhanced by the sp2 nature of the C atom to which chlorine is attached.
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Statement $I:$ The melting point of monocarboxylic acid with even number of carbon atoms is higher than that of with odd number of carbon atoms acid immediately below and above it in the series.
Statement $II :$ The solubility of monocarboxylic acids in water decreases with increase in molar mass.
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