# Triplets?

Chemistry Level pending

The above are space-filling models for three hydrogen compounds with carbon group elements. The boiling points of these three compounds are as follows: $\text{CH}_4 (-162^\circ\text{C}) < \text{SiH}_4 (-112^\circ\text{C}) < \text{GeH}_4 (-88^\circ\text{C}).$ Which of the following is the most relevant explanation for the differences in the boiling points?

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