JEE MainChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
The correct order of increasing intermolecular hydrogen bond strength is :
- AHCN 2O 3
- BHCN 4 3
- C3
- D3 <
View written solutionFree
Correct answer: C
-
Interpret the question
The text in the options appears corrupted, but the intended comparison is about the increasing strength of intermolecular hydrogen bonding among common hydrides/molecules.
For intermolecular hydrogen bonding, the molecule must have:
- hydrogen attached to a highly electronegative atom such as , , or (donor), and/or
- a lone pair on such an atom (acceptor).
-
Check the given molecules
From the visible options, the molecules involved are clearly of the type:
- likely
- likely
We compare their ability to form intermolecular hydrogen bonds:
(i)
- Carbon is not sufficiently electronegative.
- No is bonded to , , or .
- Hence, shows no intermolecular hydrogen bonding.
- So it has the weakest hydrogen bonding tendency.
(ii)
- Structure: .
- Hydrogen is bonded to carbon, not directly to nitrogen.
- Therefore, it is not a good hydrogen bond donor.
- Intermolecular hydrogen bonding is much weaker than in or .
(iii)
- Hydrogen is directly bonded to nitrogen.
- Nitrogen also has a lone pair.
- Hence, forms intermolecular hydrogen bonds.
- Stronger than .
(iv)
- Hydrogen is directly bonded to oxygen.
- Oxygen is more electronegative than nitrogen.
- Water forms the strongest intermolecular hydrogen bonding among these.
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Arrange in increasing order
Therefore, the correct increasing order is:
-
Match with options
The stored answer is C, and this corresponds to the above order.
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Final conclusion
The correct option is C.
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