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Which of the following is false?

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a
Van der Waals' forces are responsible for the formation of molecular crystals.
b
Branching lowers the boiling points of isomeric organic compounds due to reduction in the van der Waals' force of attraction.
c
In graphite, van der Waals' forces act between the carbon layers.
d
Boiling point of NH3 is greater than.SbH3.

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detailed solution

Correct option is D

In general, compounds' melting and boiling temperatures rise with decreasing group size, however, due to hydrogen bonding, is a PH3 has a greater boiling point than PH3 and AsH3, despite Sb's larger atomic mass. As a result, SbH3 has a higher boiling point than NH3.

Hence, the option D is correct.

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