See image — Aldehydes Ketones and Carboxylic Acids Chemistry Question

💡 Solution & Explanation

Step-by-step matching of each description (A–L) to the correct example (a–n): A. 'An acetal derivative of a ketone.' An acetal has two OR groups on the same carbon. Example (l) shows CH3-C(OCH3)2-CH3, which is 2,2-dimethoxypropane, the acetal of acetone (a ketone). Answer: l. B. 'A chiral ketone.' A chiral ketone has a stereocenter adjacent to or within the carbonyl compound. Example (g) shows 1-phenyl-2-methylbutan-1-one: Ph-C(=O)-CH(CH3)-CH2CH3. The alpha carbon bears four different groups (H, CH3, CH2CH3, and C(=O)Ph), making it chiral. Answer: g. C. 'An aldehyde that gives an aldol condensation with itself.' For self-aldol condensation, the aldehyde must have alpha hydrogens. Example (n) is propanal (CH3CH2CHO), a simple aldehyde with alpha hydrogens that can undergo self-aldol condensation. Answer: n. D. 'An oxime derivative.' An oxime is R2C=N-OH. Example (k) shows acetophenone oxime: Ph-C(=N-OH)-CH3, which is the oxime of acetophenone. Answer: k. E. 'A reagent that reduces aldehydes to 1-degree alcohols.' NaBH4 in aqueous alcohol is a mild reducing agent that reduces aldehydes (and ketones) to alcohols. Example (h) is NaBH4 aq. alcohol. Answer: h. F. 'An alpha, beta-unsaturated ketone.' An enone has a C=C conjugated with C=O. Example (c) is 2-cyclohexen-1-one (cyclohexenone), a classic alpha,beta-unsaturated ketone. Answer: c. G. 'A reagent that oxidizes aldehydes to carboxylic acids.' Tollens' reagent [Ag(NH3)2(+) OH(-)] is the classic reagent for oxidizing aldehydes to carboxylic acids (silver mirror test). Example (j). Answer: j. H. 'A reagent that reduces ketones to alkanes.' The Clemmensen reduction uses Zn(Hg) amalgam in acidic conditions (H3O+) to reduce a carbonyl to a methylene (C=O -> CH2). Example (f) is Zn(Hg), H3O(+). Answer: f. I. 'An enamine derivative of a ketone.' An enamine is formed when a secondary amine reacts with a ketone. Example (m) shows N-(cyclohex-2-enyl)pyrrolidine, an enamine formed from cyclohexanone and pyrrolidine. Answer: m. J. 'An intermediate in imine formation.' Imine formation proceeds through a hemiaminal intermediate (carbinolamine): a carbon bearing both OH and NHR'. Example (d) shows R-configured carbon with OH, NHR', H, and R — a hemiaminal. Answer: d. K. 'A cyclic hemiacetal.' A cyclic hemiacetal has one OH and one OR on the same carbon within a ring. Example (e) shows a six-membered ring (tetrahydropyran) with OH and CH3 at the anomeric carbon — a cyclic hemiacetal. Answer: e. L. 'A cyanohydrin derivative.' A cyanohydrin has both OH and CN on the same carbon. Example (b) shows 1-cyanocyclohexan-1-ol: cyclohexane with OH and CN at C1. Answer: b. Therefore, the correct answer is {"A": "l", "B": "g", "C": "n", "D": "k", "E": "h", "F": "c", "G": "j", "H": "f", "I": "m", "J": "d", "K": "e", "L": "b"}.