Assertion (A) Ethanol is a weaker acid than phenol.
Reason (R) Sodium ethoxide may be prepared by the reaction of ethanol with aqueous NaOH.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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Assertion :The value of enthalpy of neutralisation of weak acid and strong base is always numerically less than 57.1 kJ. Reason: All the OH− ions furnished by 1 gram equivalent of strong base are not completely neutralized.

The correct option is C Assertion is correct but Reason is incorrectThe value of enthalpy of neutralisation of weak acid and strong base is always less than 57.1Kj because some amount of heat is used in the ionization of weak acid,so, the assertion is correct but reason is incorrect.

Assertion :The value of enthalpy of neutralisation of weak acid and strong base is always numerically less than $57.1 k J$ . Reason: All the ${O H}^{-}$ ions furnished by $1$ gram equivalent of strong base are not completely neutralized.

The correct option is C Assertion is correct but Reason is incorrect
The value of enthalpy of neutralisation of weak acid and strong base is always less than $57.1 K j$ because some amount of heat is used in the ionization of weak acid,
so, the assertion is correct but reason is incorrect.