1.

Which is the most effective ion in an SN^(2) displacement on methyl bromide?

Answer»

`C_(6) H_(5)O^(theta)`
OVERSET(theta)(O)H`
`C_(6)H_(5)O^(theta)`
`CH_(3)COO^(theta)`

SOLUTION :More the nucelophilc CHARACTER more the `SN^(2)` reaction. Basically and nucleophilicity are same when the nucelphilic centres are same.
Acidic order:
`HNO_(3) gt CH_(3) C COOH gt C_(6) H_(5) OH gt H_(2)O gt C_(2) H_(5)OH`
Basic and nucleophiliic order:
`NO_(3)^(o-) lt CHCOO^(o-) lt C_(6) H_(5)OO^(o-) lt O^(o-)H lt C_(2)H_(5) overset(o-)(O)`


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