Q. Consider the following redox reactions given below:
I.
II.
III.
Which of the above is/are not disproportionation reaction?

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I and II

II and III

I and III

I, II and III

Solution:

I.
It is a redox reaction but not a disproportionation reaction. Since, different N-species are involved.
II.
Same as (I)
III.
Thus, it is also not a disproportionation reaction.

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Q. Consider the following redox reactions given below: I. II. III. Which of the above is/are not disproportionation reaction?