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JEE Main levelSingle correct optionDifficulty 2 of 3rx095

Which of the following is NOT a disproportionation reaction?

A $Cl X_{2} + 2 OH X^{-} Cl X^{-} + ClO X^{-} + H X_{2} O$
B $3 NO X_{2} + H X_{2} O 2 HNO X_{3} + NO$
C $2 H X_{2} S + SO X_{2} 3 S + 2 H X_{2} O$
D $2 Cu X^{+} Cu X^{2 +} + Cu$

Answer: C

In

2 H X_{2} S + SO X_{2} 3 S + 2 H X_{2} O

two different species containing sulphur (-2 and +4) converge to S (0); this is comproportionation, the reverse of disproportionation. In the other three, a single species or element splits into higher and lower oxidation states.

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