Question

The increasing order of boiling points of the following compounds is :

• A. I < IV < III < II
• B. IV < I < II < III
• C. I < III < IV < II
• D. III < I < II < IV

Answer 1

Answer: (A)

Alter

Increasing order of boiling point is :



$\Rightarrow$ Show hydrogen bonding from $-O-H$ group only



$\Rightarrow$ Shows stronger hydrogen bonding from both sides of $-OH$ group as well as $-N{O}_2$ group.



$\Rightarrow$ Shows stronger hydrogen from both side of

-OH group as well as $-N{H}_2$ group.



$\Rightarrow$ Shows stronger hydrogen bonding from one side $-$ OH-group and another side of $-OC{H}_3$ group shows only dipole-dipole interaction.

$\Rightarrow$ Hence correct order of boiling point is:

$(I)<(IV)<(III)<(II)$