( A ) $ (CH_3)_3 \overline{C} >(CH_3)_2 \overline{C}H > C_6H_5 \overline{C} H_2 > \overline{C}Cl_3 $
( B ) $(CH_3)_2 \overline{C}H > \overline{C}Cl_3 > C_6H_5 \overline{C} H_2 > (CH_3)_3 \overline{C} $
( C ) $\overline{C}Cl_3 > C_6H_5 \overline{C} H_2 > (CH_3)_2 \overline{C}H> (CH_3)_3 \overline{C}$
( D ) $ C_6H_5 \overline{C} H_2 > \overline{C}Cl_3 > (CH_3)_3 \overline{C} >(CH_3)_2 \overline{C}H$