Which of the following are not disproportionation reactions?
(I) 
(II) 
(III) 
(IV) 
Text Solution
Verified by ExpertsThe correct answer is:
B
Disproportionation means same element in one oxidation state is simultaneously oxidised and reduced.
• 
is reduced while 
is oxidised-different elements change , → not disproportionation.
• 
: 
is reduced (dichromate is an oxidant) while 
is oxidised → not disproportionation.
• 
: 
and 
classic disproportionation of chlorine in alkali.
• 
starts in two different states (-3 in 
, +3 in 
) and both go to 
internal redox, not disproportionation.
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