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Question

Which of the following is disproportionation reaction?

A
CH4+2O2CO2+2H2O
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B
2NO2+2OHNO2+NO3+H2O
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C
CH4+4Cl2CCl4+4HCl
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D
2F2+2OH2F+OF2+H2O
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Solution

The correct option is B 2NO2+2OHNO2+NO3+H2O
Reactions in which the same substance is oxidised as well as reduced are called disproportionation reactions.
Thus, in reaction (d), N is both oxidised as well as reduced since the oxidation number of N increases from +4 in NO2 to +5 in NO3 and decreases from +4 in NO2 to +3 in NO2.
In all other option, no substance undergoes both oxidation and reduction.
Hence, option (d) is the correct answer.

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