Intramolecular hydrogen bonding is present in
- HF
The Correct Option is A
Solution and Explanation
Step 1: Understanding Intramolecular Hydrogen Bonding
Intramolecular hydrogen bonding occurs when a hydrogen bond forms between a hydrogen atom and an electronegative atom (such as oxygen or nitrogen) within the same molecule, rather than between different molecules.
Step 2: Examining the Given Options
Option (1): The molecule \( C_6H_4NO_2OH \) (hydroxy-nitrobenzene) contains a hydroxy (-OH) group, which can form an intramolecular hydrogen bond with the nitro (-NO₂) group. This leads to a stable structure with intramolecular hydrogen bonding.
Option (4) and Option (2): These molecules do not exhibit a favorable geometry for intramolecular hydrogen bonding due to their structure. Instead, they are more likely to engage in intermolecular hydrogen bonding.
Option (3): In HF, hydrogen bonding occurs, but it is intermolecular, not intramolecular.
Step 3: Conclusion
Thus, the correct answer is: Option (1)
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