Arrange the following :
(i) `-NO_(2), -COOH, -F, -CN, -I`, in decreasing order of -I effect.
(ii) `CH_(3)^(-), D-, (CH_(3))_(3)C-, (CH_(3))_(2)CH-, CH_(3)CH_(2^(-))`, in increasing order of +I effect.

Explanation

To solve the question, we need to analyze the -I (negative inductive) effect and +I (positive inductive) effect of the given groups.

### Part (i): Arrange `-NO2, -COOH, -F, -CN, -I` in decreasing order of -I effect.

1. **Identify the groups and their -I effects:**
- **-NO2 (Nitro group)**: Strong -I effect due to the presence of electronegative oxygen and the resonance effect.
- **-CN (Cyanide group)**: Moderate -I effect; carbon is sp hybridized and has a strong electronegative nitrogen.
- **-COOH (Carboxylic acid)**: Moderate -I effect; the -OH part can donate electrons, but the carbonyl (C=O) pulls electrons away.
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