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easyMCQNEET (UG) 20242026Chemistry
1 mark

Given below are two statements:Statement I: The boiling point of three isomeric pentanes follows the order: -pentane isopentane neopentane.Statement II: When branching increases, the molecule attains a spherical shape, reducing surface area and intermolecular forces, thereby lowering the boiling point.

  1. A
    Both Statement I and Statement II are incorrect.
  2. B
    Statement I is correct but Statement II is incorrect.
  3. C
    Statement I is incorrect but Statement II is correct.
  4. D
    Both Statement I and Statement II are correct.

Solution & Step-by-step Explanation

Boiling points of alkanes are determined by Van der Waals forces, which depend on surface area.Statement I: Isomers with straight chains have larger surface areas. -pentane (straight) isopentane (1 branch) neopentane (2 branches). This is correct.Statement II: Branching makes the molecule more spherical/compact, minimizing the surface area and weakening the Van der Waals attractions. This is also correct.

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Try it yourself before checking the explanation above.

Given below are two statements:Statement I: The boiling point of three isomeric pentanes follows the order: -pentane isopentane neopentane.Statement II: When branching increases, the molecule attains a spherical shape, reducing surface area and intermolecular forces, thereby lowering the boiling point.
A
Both Statement I and Statement II are incorrect.
B
Statement I is correct but Statement II is incorrect.
C
Statement I is incorrect but Statement II is correct.
D
Both Statement I and Statement II are correct.

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Organic ChemistryAlkanesBoiling Point

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