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Boiling point of phosphine is less than ...

Boiling point of phosphine is less than that of ammonia though its molecule size is more. Assign reason.

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In ammonia `(NH_(3))`, the molecules are involved in the intermolecular hydrogen bonding on account of the polarity of N-H bonds. But the same is not possible in molecules of phosphine `(PH_(3))` since the polarity of P-H bond is negligible as compared to N-H bond. This is due to lesser electronegativity of phosphorus (2.1) as compared to nitrogen (3.1). Therefore, boiling point of ammonia is more than that of phosphine.
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  • The boiling point of ethanol should be less than that of

    A
    `CH_3-O-CH_3`
    B
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    C
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    D
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  • Asserion (A): The boiling point of C_(2)H_(5)OH is less than that of H_(2)O though the molecular weight of C_(2)H_(5)OH is more than that of water. Reason (R): C_(2)H_(5)OH molecules are not highly associated through hydrogen bonding as water is

    A
    Both A and R are true and R is the correct explanation to A
    B
    Both A and R are true and R is not the correct explanation to A
    C
    A is true but R is false
    D
    A is false but R is true

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