Question

STATEMENT-1: The boiling point of $C_2{H}_{5}OH$ is less than that of $H_{2}O$ though the molecular weight of $C_2{H}_{5}OH$ is more than that of water.
STATEMENT-2: $C_2{H}_{5}OH$ molecules are not highly associated through hydrogen bonding as in water.

• A. STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
• B. STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1
• C. STATEMENT-1 is True, STATEMENT-2 is False
• D. STATEMENT-1 is False, STATEMENT-2 is True

Answer 1

The correct option is A STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1

The hydrogen bonding in a water molecule is higher than the ethanol molecule. The attraction of the $-OH$ bonding electron towards the oxygen atom leaves a deficiency on the site of the $H$ atom related to the oxygen atom. As a result, the attractive force between the $O-H$ hydrogen and $O$ atom of a nearby water molecule is strongest when the three atoms are closer to each other. Due to this, $H$ bonding in water is higher than the ethanol molecule.

So, the boiling point of $C_2{H}_{5}OH$ is less than that of $H_{2}O$