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Q.
Which is the most effective ion in an $SN ^2$ displacement on methyl bromide?
Haloalkanes and Haloarenes
Solution:
More the nucleophilic character, more is the $SN ^2$ reaction. Basicity and nucleophilicity are same when the nucleophilic centres are same
Acidic order: $HNO _3> CH _3 COOH > C _6 H _5 OH$ $> H _2 O > C _2 H _5 OH$
Basic and nucleophilic order:
$NO _3^{\ominus}< CH _3 COO ^{\ominus}< C _6 H _5 O ^{\ominus}< \overset{\ominus}{O}H < C_2 H _5 \overset{\ominus}{ O }$
Therefore, $C _2 H _5 O ^{\ominus}$ is the most effective nucleophile among the given nucleophiles