Why PH(3), has lower boiling point than ...

Why `PH_(3)`, has lower boiling point than `NH_(3)`?

Text Solution

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The electronegativity of N is much higher than that of P. So, `NH_(3)`, undergoes extensive H-bonding and hence, it exists as an associated molecule. To break these additional bonds, the large amount of energy is required while `PH_(3)`, does not form H-bond and hence, exists as discrete molecule.

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Knowledge Check

Which has the lowest boiling point:

A

`NH_3`

B

`PH_3`

C

`SbH_3`

D

`BiH_3`

NH_3 has a much higher boiling point than PH_3 because:

A

`NH_3` has a higher molecular weight

B

`NH_3` undergoes umbrella inversion

C

`NH_3` forms hydrogen bond

D

`NH_3` contains ionic bonds whereas `PH_3` contains covalent bonds.

Which one has highest boiling point :

A

Ethane

B

Butane

C

Butan-1-ol

D

Pentane

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