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Question

Arrange in decreasing order of boiling point.

SiH4, GeH4, SnH4, CH4

A
CH4> SiH4> GeH4> SnH4
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B
SnH4> GeH4> SiH4> CH4
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C
SiH4> GeH4> SnH4> CH4
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D
GeH4> SnH4> SiH4> CH4
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Solution

The correct option is B SnH4> GeH4> SiH4> CH4
Observe that H is attached to carbon group elements. None of them enough electronegativity to reflect as H-bonding

Thus, only molecular weight is the criteria.

From periodic table, size and weight in order Sn > Ge > Si > C

Thus molecular weight order is SnH4>GeH4>SiH4>CH4.

Boiling point also follows the same order. So, SnH4 has highest boiling point.

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