Between 2-methylhexane and 2,2-dimethylpentane, which has a higher boiling point?

2-methylhexane

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2,2 dimethylpentane

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Both have equal boiling point

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None of these

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Solution

The correct option is A 2-methylhexane
The boiling point of 2-methylhexane is higher than the boiling point of 2,3-dimethylpentane due to a lower degree of branching.
Thus, when the degree of branching is higher the boiling point is lower and vice versa.

So, the correct option is $A$

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Liquid a has higher vapour pressure than liquid b. Which liquid out of a and b will have lower boiling point.

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