Chemistry - GOC Question with Solution | TestHub

An isohyptic reaction is one in which the oxidation states of the reacting carbon atoms do not change. A substitution reaction is isohyptic, as shown below:

In this reaction, the carbon atom maintains an oxidation state of -2 (in both CH₃Cl and CH₃OH).

A non-isohyptic reaction changes the oxidation state of carbon. For example, in an addition reaction:

Each carbon atom changes its oxidation state from -2 (in ethene) to -1 (in 1,2-dichloroethane). In an elimination reaction:

The two carbon atoms change their oxidation states from -3 and -1 (in bromoethane) to -2 and -2 (in ethene).

The correct answer is (C).