Question

Out of 2,3-dimethylbutane and 2,2-dimethylbutane which has a higher boiling point ? And why ?

Answer 1

2,3 dimethyl butane has higher mp and bp due to better symmetry.
2,2 dimethyl butane do not have plane of symmetry
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Answer 2

The boiling point of 2,3-dimethyl butane is higher than 2,2-dimethyl butane.

Explanation:

• The given compound differ in the fact that the methyl group is attached in different carbon.
• In the case of 2,3-dimethyl butane, two methyl groups are present which are attached to the second and third carbon.
• On the other hand, in 2,2-dimethyl butane two methyl groups are attached to the second carbon.
• As the structure of 2,2-dimethylbutane is less symmetric than 2,3-dimethylbutane, the latter has more boiling than the former.
• The boiling point of 2,3-dimethyl butane and 2,2-dimethyl butane are 58°C and 50°C respectively.

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