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Select the compound with the lowest boiling point.

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${NH}_{3}$

${PH}_{3}$

${AsH}_{3}$

${SbH}_{3}$

answer is B.

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Detailed Solution

Because of hydrogen bondings, ammonia has higher boiling point than phosphine. The latter has smaller boiling point as compared to ${AsH}_{3}$ and ${SbH}_{3}$ because of lighter mass.

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