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Identify the most stable species in the following set of ions giving reasons:

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(i) CH_{3}^{+} will be more stable. This is because bromine atom destabilises the positive charge on a carbon atom. Bromine atom has a lone pair of electrons and is from the electron-withdrawing group.

(ii) ^-CCl_{3} will be most stable. This is because chlorine is more electron-withdrawing atom. The negative charge on carbon will be stabilised by the chlorine atom. As the number of chlorine atoms that are attached to carbocation increase, its stability also enhances.

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