Which of the following has the highest boiling point ?
i. 2-Methyl pentane
ii. 2,3-Dimethyl butane
iii. 2,2-Dimethyl butane
b. What effect does branching of an alkane chain has on its melting point ?

Explanation

To determine which of the given compounds has the highest boiling point, we will analyze the structures of each compound and their degree of branching.

### Step-by-Step Solution:

1. **Identify the Structures**:
- **2-Methylpentane**: This compound has a straight-chain pentane with one methyl group attached to the second carbon.
- **2,3-Dimethylbutane**: This compound has a butane chain with two methyl groups, one on the second carbon and one on the third carbon.
- **2,2-Dimethylbutane**: This compound has a butane chain with two methyl groups both attached to the second carbon.
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