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Chapter 5: Problem 79
Malonic acid on heating at \(430 \mathrm{~K}\) yields (a) formic acid (b) succinic acid (c) acetic acid (d) lactic acid
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Directions: Each question contains Statement- 1 and Statement- 2 and has the following choices (a), (b), (c) and (d), out of which ONLY ONE is correct. (a) Statement- 1 is True, Statement- 2 is True; Statement- 2 is a correct explanation for Statement- 1 (b) Statement- 1 is True, Statement- 2 is True; Statement- 2 is NOT a correct explanation for Statement- 1 (c) Statement- 1 is True, Statement- 2 is False (d) Statement- 1 is False, Statement- 2 is True Statement 1 Acetals and ketals are unstable in aqueous acid conditions, but quite stable to alkaline conditions. and Statement 2 A weaker base like (OH) cannot displace a stronger base like (OR) found in acetals and ketals.
The product formed by the reaction of ethyl acetate with sodium ethoxide is (a) ethyl acetoacetate (b) ethyl propionate (c) Propane-2, 3-dione (d) 3-oxobutanal
2-Pentanone can be converted to butanoic acid by reaction with (a) Fehling's solution (b) \(\mathrm{HCN} / \mathrm{H}_{3} \mathrm{O}^{+}\) (c) \(\mathrm{H}_{2} \mathrm{NNH}_{2}, \mathrm{KOH} / \mathrm{H}_{3} \mathrm{O}^{+}\) (d) \(\mathrm{NaOH}, \mathrm{I}_{2} / \mathrm{H}_{3} \mathrm{O}^{+}\)
Match the elements of Column I to elements of Column II. There can be single or multiple matches. Column I (a) \(\left(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CO}\right)_{2} \mathrm{O}\) (b) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COCl}\) (c) \(\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}\) (d) \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CHO}\) Column II (p) Friedel-Crafts reaction (q) Benzoin condensation (r) Perkin reaction (s) Rosenmund's reduction (t) Claisen condensation
Salicylic acid is more acidic than o-methoxybenzoic acid though both have electron releasing groups i.e., \(-\mathrm{OH}\) and \(-\mathrm{OCH}_{3} .\) This is because (a) \(-\mathrm{OH}\) is a stronger electron releasing group compared to \(-\mathrm{OCH}_{3}\). (b) salicylate ion is stabilized by intramolecular hydrogen bonding. (c) salicylic acid has two replaceable hydrogen atoms. (d) \(-\mathrm{OCH}_{3}\) has a stronger steric effect to prevent the stabilization of the carboxylate anion.
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