Least thermally stable is

C C l_{4}

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S i C l_{4}

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G e C l_{4}

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G e B r_{4}

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Solution

The correct option is D $G e B r_{4}$
The thermal stability of tetrahalides decreases in order $C X_{4} > S i X_{4} > G e X_{4} > S n X_{4}$ and in terms of same metal with different halides is in order of
$M F_{4} > M C l_{4} > M B r_{4} > M I_{4}$ . Thus Least thermally stable is $M B r_{4}$ .

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