323783
Assertion : Carboxylic acids on heating with alcohols in presence of dehydrating agent gives esters. Reason : Ethanol reacts with excess of sulphuric acid at \(170^{\circ} \mathrm{C}\) and forms esters.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Esterification does not take place between ethanol and excess of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) at \(170^{\circ} \mathrm{C}\). On heating, ethanol with \(\mathrm{H}_{2} \mathrm{SO}_{4}\) at \(170^{\circ} \mathrm{C}\), the ethyl hydrogen sulphate formed readily loses \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to give ethylene. \({{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}{\text{OH + }}{{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}} \to \mathop {{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}{\text{HS}}{{\text{O}}_{\text{4}}}}\limits_{{\text{ (Un}}\,{\text{stable}}\,\,{\text{at}}\,\,{\text{170}}^\circ {\text{C ) }}} \to {{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}\) So the option (3) is correct.
323783
Assertion : Carboxylic acids on heating with alcohols in presence of dehydrating agent gives esters. Reason : Ethanol reacts with excess of sulphuric acid at \(170^{\circ} \mathrm{C}\) and forms esters.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Esterification does not take place between ethanol and excess of \(\mathrm{H}_{2} \mathrm{SO}_{4}\) at \(170^{\circ} \mathrm{C}\). On heating, ethanol with \(\mathrm{H}_{2} \mathrm{SO}_{4}\) at \(170^{\circ} \mathrm{C}\), the ethyl hydrogen sulphate formed readily loses \(\mathrm{H}_{2} \mathrm{SO}_{4}\) to give ethylene. \({{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}{\text{OH + }}{{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}} \to \mathop {{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{5}}}{\text{HS}}{{\text{O}}_{\text{4}}}}\limits_{{\text{ (Un}}\,{\text{stable}}\,\,{\text{at}}\,\,{\text{170}}^\circ {\text{C ) }}} \to {{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}\) So the option (3) is correct.
