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Detailed Solution

$X_{b}$ most difficult to replace

Aryl halides & vinyl halides are least reactive towards nucleophile substitution $(S N^{1} (or) S N^{2})$

Reasons for non-reactivity of Aryl and vinyl halides

(1) Stabilize through resonance

(2) C - X bond acquires double bond character due to resonance

(3) Difficult to remove $X^{-}$ from more EN $s p^{2} -$ carbon

(4) $C H_{2} = C H -$ group (or) $C_{6} H_{5} -$ group itself is electron rich

$X_{a}$ can be replaced through $S N^{2}$ is favvoured

stabilizes through resonance $S N^{1}$ is favoured

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