In which of the following hydrogen bond does not exist?
Show Hint
- Salicylaldehyde
- Catechol
- Salicylic acid
- Acetophenone
The Correct Option is D
Solution and Explanation
Step 1: Recall the requirement for hydrogen bonding.& nbsp;
Hydrogen bonding requires:
\[ \boxed{ \text{A hydrogen atom bonded to } \mathrm{O},\ \mathrm{N}\ \text{or}\ \mathrm{F} } \]
along with a lone pair on a nearby electronegative atom.
Step 2: Examine each compound.
\[ \begin{aligned} \text{Salicylaldehyde} & amp;\rightarrow \text{Intramolecular hydrogen bonding present},\\ \text{Catechol} & amp;\rightarrow \text{Hydrogen bonding present},\\ \text{Salicylic acid} & amp;\rightarrow \text{Intramolecular hydrogen bonding present},\\ \text{Acetophenone} & amp;\rightarrow \text{No }-\mathrm{OH}\text{ or }-\mathrm{NH}\text{ group}. \end{aligned} \]
Therefore, acetophenone cannot form hydrogen bonding within its molecule.
Step 3: State the answer.
Hence,
\[ \boxed{\text{Hydrogen bonding does not exist in acetophenone}.} \]
Therefore, the correct option is \[ \boxed{(D)}. \]
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