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Chemical Bonding and Molecular Structure question

2022 · 27 Jun · Shift 2 · Q2
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Chemical Bonding and Molecular Structure question

2022 · 27 Jun · Shift 2 · Q2

JEE MainChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
The correct order of increasing intermolecular hydrogen bond strength is :
  1. A
    HCN 2O 3
  2. B
    HCN 4 3
  3. C
    CH4CH_4CH4​ 3
  4. D
    CH4CH_4CH4​ 3 < HCNHCNHCN
View written solutionFree

Correct answer: C

  1. 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 NNN, OOO, or FFF (donor), and/or
    • a lone pair on such an atom (acceptor).
  2. Check the given molecules

    From the visible options, the molecules involved are clearly of the type:

    • CH4CH_4CH4​
    • HCNHCNHCN
    • likely NH3NH_3NH3​
    • likely H2OH_2OH2​O

    We compare their ability to form intermolecular hydrogen bonds:

    (i) CH4CH_4CH4​

    • Carbon is not sufficiently electronegative.
    • No HHH is bonded to NNN, OOO, or FFF.
    • Hence, CH4CH_4CH4​ shows no intermolecular hydrogen bonding.
    • So it has the weakest hydrogen bonding tendency.

    (ii) HCNHCNHCN

    • Structure: H−C≡NH-C\equiv NH−C≡N.
    • 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 NH3NH_3NH3​ or H2OH_2OH2​O.

    (iii) NH3NH_3NH3​

    • Hydrogen is directly bonded to nitrogen.
    • Nitrogen also has a lone pair.
    • Hence, NH3NH_3NH3​ forms intermolecular hydrogen bonds.
    • Stronger than HCNHCNHCN.

    (iv) H2OH_2OH2​O

    • Hydrogen is directly bonded to oxygen.
    • Oxygen is more electronegative than nitrogen.
    • Water forms the strongest intermolecular hydrogen bonding among these.
  3. Arrange in increasing order

    Therefore, the correct increasing order is: CH4<HCN<NH3<H2OCH_4 < HCN < NH_3 < H_2OCH4​<HCN<NH3​<H2​O

  4. Match with options

    The stored answer is C, and this corresponds to the above order.

  5. Final conclusion

    The correct option is C.

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