are less reactive due to stability of
bond due to resonance effect.
(ii) more electronegativity
of C on which (X) is
instability of phenyl carbocation
is not possible. But reactivity of (C?X) bond can be increased by
high temperature (623 K) and high pressure (300 atm).
electron-withdrawing group as ??CN,
?COOH in ortho and para-position.
(ii) (a) water is
decolourised by (C=C) bond.
decolourise alkaline (Baeyer's
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