COMEDK20269 May 2026Evening ShiftChemistryAlcohols Phenols and EthersActual
Choose the correct reason: o-hydroxybenzaldehyde is a liquid at room temperature while p -hydroxy-benzaldehyde is a high melting solid, because
Options
- Ap-hydroxybenzaldehyde, shows intramolecular hydrogen bonding while in o-hydroxy benzaldehyde there is stronger
- Bo-hydroxybenzaldehyde shows association of the molecules while in p -hydroxy benzaldehyde there is no associat
- Co-hydroxybenzaldehyde shows only weak Vanderwal's forces of attraction while in p -hydroxy benzaldehyde there
- Do-hydroxybenzaldehyde shows intramolecular hydrogen bonding while in p -hydroxy benzaldehyde there is no intra
Correct answer
D. o-hydroxybenzaldehyde shows intramolecular hydrogen bonding while in p -hydroxy benzaldehyde there is no intra
Step-by-step solution
o-hydroxybenzaldehyde exhibits intramolecular hydrogen bonding due to the proximity of the -OH and -CHO groups. This restricts the formation of intermolecular hydrogen bonds, resulting in weaker intermolecular forces and making it a liquid at room temperature. In p-hydroxybenzaldehyde, the -OH and -CHO groups are far apart, so it cannot form intramolecular hydrogen bonds. Instead, it forms extensive intermolecular hydrogen bonds, leading to molecular association and a high melting point, making it a solid. Thus, o-