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The boiling points of NH(3) , H(2)O and ...

The boiling points of `NH_(3) , H_(2)O` and HF are higher than those of the hydrides of the subsequent members of the group. Give your reasons.

Text Solution

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The boiling points of `NH_(3),H_(2)O` and HF are higher than those of hydrides of the subsequent members of the group.
Reasons :
`toNH_(3),H_(2)OandHF` are electron rich hydrides and these have 1, 2 and 3 lone pairs respectively.
`to` Due to the presence of lonepairs on the high electronegative elements results in the formation of hydrogen bond [i.e. intermolecular hydrogen bonding].
`to` Due to the formation of hydrogen bond association of molecules takes place. Hence these hydrides has high boiling points.
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Knowledge Check

  • The boiling point of p-nitrophenol is higher than that of o-nitrophenol because

    A
    `NO_2` group at para position behaves in a different way from that at ortho position
    B
    Intramolecular hydrogen bonding exists in p-nitrophenol
    C
    There is intermolecular hydrogen bonding in p-nitrophenol
    D
    p-nitrophenol has a higher molecular weight than o-nitrophenol

  • The relative nucleophilicity of NH_3, H_2O and HF towards bromoethane is

    A
    `H_3N gt H_2O gt HF`
    B
    `HF gt H_2O gt NH_3`
    C
    `NH_3 gt HF gt H_2O`
    D
    `H_2O gt NH_3 gt HF`

  • The boiling point D_(2)O is greater than H_(2)O it if because

    A
    `D_(2)O` has a lower ionic product
    B
    `D_(2)O` has a lower dielectric constant
    C
    `D_(2)O` is an associated liquid
    D
    The molecular weight of `D_(2)O` is greater than `H_(2)O`

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