Given below are two statements: Statement I: o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding.…
Chemical Bonding · Class 11 · JEE Main Previous Year Question
Given below are two statements:
Statement I: o-Nitrophenol is steam volatile due to intramolecular hydrogen bonding.
Statement II: o-Nitrophenol has high melting point due to hydrogen bonding.
Choose the most appropriate answer:
- a
Both Statement I and Statement II are false
- b✓
Statement I is true but Statement II is false
- c
Statement I is false but Statement II is true
- d
Both Statement I and Statement II are true
Statement I is true but Statement II is false
🧠 Compare o-nitrophenol and p-nitrophenol: the ortho isomer forms intramolecular H-bonds (the –OH and adjacent –NO₂ form a ring within the molecule).
🗺️ Evaluate Statement I — o-Nitrophenol is steam volatile due to intramolecular H-bonding:
The intramolecular H-bond in o-nitrophenol "locks up" the –OH group → the O–H cannot interact with water molecules → less association with water → volatilized with steam (steam-distillable). ✓
Statement I is TRUE ✓
Evaluate Statement II — o-Nitrophenol has HIGH melting point due to H-bonding:
Because the –OH in o-nitrophenol forms an intramolecular H-bond, there are fewer intermolecular H-bonds available → lower intermolecular association → lower melting point compared to p-nitrophenol (which has extensive intermolecular H-bonding and is NOT steam-volatile).
Statement II is FALSE ✗
⚡ Intramolecular H-bonding REDUCES intermolecular associations → lowers melting point and boiling point and increases volatility.
Practice this question with progress tracking
Want timed practice with adaptive difficulty? Solve this question (and hundreds more from Chemical Bonding) inside The Crucible, our adaptive practice platform.
More JEE Main Chemical Bonding PYQs
The correct statement(s) about Hydrogen bonding is/are: A. Hydrogen bonding exists when H is covalently bonded to a highly electronegative atom. B. Intermolecular H bonding is present in…
Given below are two statements — Assertion (A) and Reason (R): Assertion (A): PH3 has lower boiling point than NH3. Reason (R): In liquid state, NH3 molecules are associated through hydrogen bonding,…
Select the compound from the following that will show intramolecular hydrogen bonding:
Decreasing order of the hydrogen bonding in following forms of water is correctly represented by: A. Liquid water B. Ice C. Impure water
Given below are two statements — Assertion A and Reason R: Assertion A: Butan-1-ol has higher boiling point than ethoxyethane. Reason R: Extensive hydrogen bonding leads to stronger association of…