Identity the most stable species in the following sets of ions giving reasons :
(i) `overset(+) CH_3, overset(+) CH_2 Br , overset(+) C HBr_2 , overset(+) CBr_3`
(ii) `overset(-) CH_3, overset(-) CH_2 CI, overset(-) CH CI_2, overset(-) C CI_3`

Explanation

To identify the most stable species in the given sets of ions, we will analyze each set step by step.

### Part (i): Identifying the most stable carbocation

The ions provided are:
1. \( \overset{+}{CH_3} \) (methyl cation)
2. \( \overset{+}{CH_2Br} \) (bromomethyl cation)
3. \( \overset{+}{CHBr_2} \) (dibromomethyl cation)
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