Periodic Classification And Periodic Properties Ques 49
49. Which among the following is the most reactive?
(a) $\mathrm{Cl} _{2}$
(b) $\mathrm{Br} _{2}$
(c) $\mathrm{I} _{2}$
(d) ICl
(2015 Main)
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Answer:
Correct Answer: 49.(d)
Solution:
- $\mathrm{Cl} _{2}, \mathrm{Br} _{2}$ and $\mathrm{I} _{2}$ are homonuclear diatomic molecule in which electronegativity of the combining atoms is same, so they are more stable and less reactive, whereas, I and $\mathrm{Cl}$ have different electronegativities and bond between them are polarised and reactive. Therefore, interhalogen compounds are more reactive.
Time Saving Technique In this type of question of halogen, only go through the polarity of the molecules. As we know, diatomic molecule does not have polarity but molecules with dissimilar sizes have polarity resulting in more reactivity.
BETA
