Answer:
Aryl halides
are less reactive due to stability of
(C?X)
bond due to resonance effect.
(ii) more electronegativity
of C on which (X) is
attached.
(iii)
instability of phenyl carbocation
reaction
is not possible. But reactivity of (C?X) bond can be increased by
(i) using
high temperature (623 K) and high pressure (300 atm).
[1]
(ii) using
electron-withdrawing group as ??CN,
?COOH in ortho and para-position.
(i)
Or
[1]
(ii) (a) water is
decolourised by (C=C) bond.
(b) Alkenes
decolourise alkaline (Baeyer's
reagent)
[1]
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