Exams › JEE Advanced › Chemistry
Which of the following pairs of molecules can form intermolecular hydrogen bonds with each other?
- Triethyl acetamide and H2O
- Tertiary amine and ethanol
- Quinone and hydroquinone
- Ethylene glycol and triethyl phosphine
Correct answer: Triethyl acetamide and H2O
Solution
Triethyl acetamide contains a C=O group (H-bond acceptor) and water provides O-H (H-bond donor), so they can form intermolecular H-bonds. Tertiary amines have no N-H bond (no donor), so they cannot form H-bonds with ethanol in a meaningful intermolecular sense. Quinone has no O-H, and hydroquinone has O-H but quinone can only accept; however quinone lacks a suitable acceptor for hydroquinone's O-H? Actually quinone has C=O acceptors and hydroquinone has O-H donors — they CAN form H-bonds. Triethyl phosphine has no O-H/N-H.
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