Question

Consider the two molecules :
Which of the following statements about them is true ?
(a) II is capable of forming intramolecular hydrogen bonding whereas I is not
(b) Both are capable of forming equally stable intramolecular hydrogen bonding
(c) I is likely to form more stable intramolecular hydrogen bonding than II
(d) Both of them cannot form intramolecular hydrogen bonding

Answer 1

ans.(c) -as 'h' of -OH in 1 will gain more electro+ve character due to participation of lone pair of oxygen in resonance with '=' of c atom

Answer 2

The correct answer is A.

• In (I), the C-C bond is more electronegative due to the presence of double bond.
• And in (II), the hydrogen bond is weaker due to single bond.
• When OH is attached to a higher electronegative carbon, H bond is stronger. Hence, (II) has higher H-bonding and is more stable.

Hence, (I) is more likely to form hydrogen bond than (II).

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