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Question: Which of the following is/are correct statement(s) regarding 2-Methylbutane and 2, 2-Dimethylpropane...

Which of the following is/are correct statement(s) regarding 2-Methylbutane and 2, 2-Dimethylpropane?

A

Boiling point of 2- Methylbutane is greater than 2, 2-Dimethylpropane

B

Boiling point of 2, 2-Dimethylpropane is greater than 2- Methylbutane

C

Melting point of 2- Methylbutane is greater than 2, 2-Dimethylpropane

D

Melting point of 2, 2-Dimethylpropane is greater than 2- Methylbutane

Answer

(I) and (IV)

Explanation

Solution

Boiling Point:

  • 2-Methylbutane is less branched than 2,2-Dimethylpropane.

  • Less branching enhances the surface area, increasing London dispersion forces and the boiling point.

  • Therefore, 2-Methylbutane has a higher boiling point.

Melting Point:

  • 2,2-Dimethylpropane (neopentane) is more symmetrical, which allows it to pack more efficiently in the crystal lattice.

  • Better packing leads to a higher melting point compared to asymmetrical 2-Methylbutane.