Question
Which will be more reactive?
(a) $ClF_3$ or $ClF$,
(b) $BrF_5$ or $BrF$
(a) $ClF_3$ or $ClF$,
(b) $BrF_5$ or $BrF$
✓
Answer
$ClF_3$ is more reactive than $ClF$, while $BrF_5$ is more reactive than BrF. Both $ClF_3$ and $BrF_5$ are unstable compared to $ClF$ and $BrF$ respectively due to steric hindrance hence are more reactive.
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