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Explain : (a)ClCH2OCH3 (chloromethyl m...

Explain :
(a)`ClCH_2OCH_3` (chloromethyl methyl ether) undergoes `SN^1` reaction.
(b) `(+)-4` -Bromo-2-pentene forms a racemic mixture on treatment with `NaI`.

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(a) Although it is `1^@ RX`, the corresponding carbonium ion is resonance stabilised.
`.^(oplus)CH_2 -overset(ddot) underset (ddot) N -CH_3 leftrightarrow CH_2 = -overset (ddot) underset(oplus)O-CH_3`
(b) .
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