Answer:
(i) \[\overset{+}{\mathop{C}}\,{{H}_{3}}>\overset{+}{\mathop{C}}\,{{H}_{2}}Br>\overset{+}{\mathop{C}}\,HB{{r}_{2}}>\overset{+}{\mathop{C}}\,B{{r}_{3}}\]
(Decreasing stability)
Bromine being electronegative, will increase the positive charge
of carbocation hence will decrease its stability.
(ii) \[\overset{-}{\mathop{C}}\,{{H}_{3}}>\overset{-}{\mathop{C}}\,{{H}_{2}}Cl<\overset{-}{\mathop{C}}\,HC{{l}_{2}}<\overset{-}{\mathop{C}}\,C{{l}_{3}}\]
(Increasing stability)
Chlorine being electronegative, will decrease the negative charge
of carbanion hence will increase its stability.
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