Which of the following is disproportionation reaction?

Step-by-step solution

Reactions in which the same substance is oxidised as well as reduced are called disproportionation reaction. Writing the oxidation number of each element above its symbol in the given reactions. aligned & -4 C +1 h ₄+4 Cl ₂^ +4 C Cl ₄+4 +1-1 HCl & 2 ~F ₂^0+2 -2 O H ⁻ 2 -1 ~F + +2 O F ₂⁻¹+ -1 H ₂ O _ O ⁻² & 2 +4-2 ~N O ₂ +2 OH ⁻² +3 NO ₂⁻² + +5 NO ₃⁻² + +1 H ₂ O ⁻² & aligned Thus, in the reaction of NO ₂ and OH ⁻, N is both oxidised as well as reduced. Hence, the oxidation number increases from +4 in NO ₂ to +5 in N