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Which one hydrolyses at a faster rate by...

Which one hydrolyses at a faster rate by `SN^1` mechanism ?
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(a) (ii) ion is more stable than `Ph^(oplus)` ion.
(b) (ii) `(3^@ C^(oplus)` ion is more stable than .
(c) (Benzyl `C^(oplus)`) ion is more stable than `PhCH_2CH_2^(oplus)` ions (`1^@ C^(oplus)` ion).
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