The thermal stability order for group 14 halides is:

G e X_{2} < S i X_{2} < S n X_{2} < P b X_{2}

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S i X_{2} < G e X_{2} < P b X_{2} < S n X_{2}

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S i X_{2} < G e X_{2} < S n X_{2} < P b X_{2}

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P b X_{2} < S n X_{2} < G e X_{2} < S i X_{2}

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Solution

The correct option is B $S i X_{2} < G e X_{2} < S n X_{2} < P b X_{2}$
The stability of group 14 tetrahalides decreases down the group while that of dihalides increases down the the group due to an increase in inert pair effect.

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