(d) `S_(N^(1))and S_(N^(2))` not possible in the following Stearically crowded reaction center for `S_(N^(2))` brifgehesad `C^(o)=sp^(2)` hybridized not possible (beredt 's rule ) ,Hence `S_(N^(1)) and S_(N^(2))` not psosible lone paiir of Br in resonce eith Benzene ring .Hence partical double bond character NO `S_(N^(1)) and S_(N^(2))` possible `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-Br" "1^(@)C^(o+)` not atable .Hence `S_(N^(1))` not possible stearic crowed for backside attack .Hence `S_(N^(2))` not possible .
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Stearically crowded reaction center for `S_(N^(2))` brifgehesad `C^(o)=sp^(2)` hybridized not possible (beredt 's rule ) ,Hence `S_(N^(1)) and S_(N^(2))` not psosible 
lone paiir of Br in resonce eith Benzene ring .Hence partical double bond character NO `S_(N^(1)) and S_(N^(2))` possible `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-Br" "1^(@)C^(o+)` not atable .Hence `S_(N^(1))` not possible stearic crowed for backside attack .Hence `S_(N^(2))` not possible .
