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Topic: Classification, isomerism, nomenclature, preparation· Hydrocarbons

Given below are two statements:Statement I : The boiling point of three isomeric pentanes follows the ordern-pentane > isopentane > neopentaneStatement II : When branching increases, the molecule attains a shape of sphere. This results in smaller sur…

Given below are two statements:

Statement I : The boiling point of three isomeric pentanes follows the order

n-pentane > isopentane > neopentane

Statement II : When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.

In the light of the above statements, choose the most appropriate answer from the options given below:

1. Statement I is incorrect but Statement II is correct.

2. Both Statement I and Statement II are correct.

3. Both Statement I and Statement II are incorrect.

4. Statement I is correct but Statement II is incorrect.

1 answer

Best answer

Answer: 2. Both Statement I and Statement II are correct.

Key idea: among isomers, more branching means a more spherical shape and a lower boiling point.

  • Statement I: n-pentane (309 K) > isopentane (301 K) > neopentane (283 K). True.
  • Statement II: branching makes a sphere with less surface area, so weaker van der Waals forces and lower boiling point. True, and it explains I.

Option 2.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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