Question

Two molecules indicated below are capable to intramolecular H-bonding. Which is likely to form more stable hydrogen bonds?

• A. I
• B. II
• C. Both are equally capable
• D. Cannot be predicted

Answer 1

The correct option is A I

In (I), the presence of double bond makes the C−C bond more electronegative whereas in (II), there is a single bond making the hydrogen bond weaker.

H bond is stronger when OH is attached to a higher electronegative carbon. Hence,(II) has higher H-bonding and is more stable.

Option A is correct.