The toxicity is caused by the X, which halts cellular respiration by acting as a non-competitive inhibitor for an enzyme in mitochondria called cytochrome c oxidase. X is:

H C N

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H F

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H C l

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ammonia

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Solution

The correct option is A $H C N$
The toxicity is caused by the cyanide ion of $H C N$ , which halts cellular respiration by acting as a non-competitive inhibitor for an enzyme in mitochondria called cytochrome c oxidase. Specifically, $C N^{-}$ binds to iron in the heme subunit in cytochromes, interrupting electron transfer.

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