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Which of the following is false?

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a

Branching lowers the boiling points of isomeric organic compounds due to reduction in the van der Waals' force of attraction.

b

In graphite, van der Waals' forces act between the carbon layers.

c

Van der Waals' forces are responsible for the formation of molecular crystals.

d

Boiling point of ${NH}_{3}$ is greater than. ${SbH}_{3}$ .

answer is D.

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Detailed Solution

In general, compounds' melting and boiling temperatures rise with decreasing group size, however, due to hydrogen bonding, is a ${PH}_{3}$ has a greater boiling point than ${PH}_{3}$ and ${AsH}_{3}$ , despite Sb's larger atomic mass. As a result, ${SbH}_{3}$ has a higher boiling point than ${NH}_{3}$ .

Hence, the option D is correct.

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Which of the following is false?