Identify the correct order of boiling points of the following compounds.
$C H_{3} C H_{2} C H_{2} C H_{2} O H, C H_{3} C H_{2} C H_{2} C H O, C H_{3} C H_{2} C H_{2} C O O H$
(A) (B) (C)

(A) > (B) > (C)

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(A) > (C) > (B)

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Solution

The correct option is B (C) > (A) > (B)
Acid (C) forms dimer due to intramolecular H-bonding. Alcohol (A) forms intermolecular H-bonding. H-bonding in (C) is stronger than in (A). Aldehyde (B) has dipole-dipole-dipole interaction. So the order of boiling points is: (C) > (A) > (B).

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