Assertion :The rate of the reaction, A `rarr` B is the rate of change of concentration of a reactant or a product.
Reason: Rate of reaction remains constant duringthe course of reaction.

Options

A. If both (A) and (R) are correct and (R) is the correct explanation of (A)
B. If both (A) and (R) are correct, but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If both (A) and (R) are incorrect.

Answer

C

Explanation

Rate of reaction does not remain constant during the complete reaction because rate depends upon the concentration of reactants which decreases with time.