Aldehydes ketones and carboxylic acids multiple choice questions level 2 multiple choice questions class 12 objective type questions by chem educator welcome to your aldehyde ketones and carboxylic acid mcqs level 2. Free pdf download of cbse chemistry multiple choice questions for class 12 with answers chapter 12 aldehydes ketones and carboxylic acids chemistry mcqs for class 1 chapter wise with answers pdf download was prepared based on latest exam pattern students can solve ncert class 12 chemistry aldehydes ketones and carboxylic acids mcqs pdf with answers to know their preparation level. Free pdf download of cbse chemistry multiple choice questions for class 12 with answers chapter 12 aldehydes ketones and carboxylic acids chemistry mcqs for class 1 chapter wise with answers pdf download was prepared based on latest exam pattern. You might have studies this under the prepartion of alkanes using carbonyl compounds we arent using clemmensenzn hg amalgam here cuz then it will replace the oh with cl nabh4 will convert ketone to alcohol h2pt wont give this reaction it also coverts ketone to alcohol hence the answer is option b hope it helped you cheers . Mayank at first step in aldol condensation it forms ss hydroxy aldehyde which has one chiral centre hence optical isomerism only after condensation it forms but 2 en 1 al whicjh shows geometrical iso but here the question asks us about the first step