Answer: (i) The carbonyl group of aldehydes and ketones is reduced to the CH 2 group on treatment with zinc amalgam and concentrated hydrochloric acid. (ii) Aldehydes which do not have an α-hydrogen ...
Aliphatic aldehydes and reducing sugars will form a yellow-to-red precipitate with Benedict's reagent, causing the blue solution to appear green-to-red. This reaction can be used as a test for such ...