Ncert Exercises & Solutions

The element that does not show a disproportionation tendency is/are:

1.	Cl	2.	Br
3.	F	4.	I

Hint: For disproportionation tendency element must show both positive and negative oxidation number.

Being the most electronegative element, F can only be reduced and hence it always shows an oxidation number of -1. Further, due to the absence of d-orbitals it cannot be oxidised and hence it does not show positive oxidation numbers.

In other words, F cannot be oxidised as well as reduced simultaneously and hence does not show disproportionation reactions.

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