Aldehyde ketones & carboxylic Acid MCQs for NEET — Chemistry Questions with Answers

(c) R₂CCl₂ $\stackrel{\mathrm{HOH}}{\to }$R₂C(OH)₂ $\to$R₂CO

Ketones are prepared by Oppenaauer's oxidation, which involves the oxidation of a secondary alcohol using a mixture of aluminum isopropoxide and acetone. This reaction is used to convert a secondary alcohol into a ketone by removing hydrogen from the alcohol and adding it to the acetone.

(a) Cl₂ reacts with CH₃CHO, CH₃COCH₃ and C₆H₅CHO to give CCl₃CHO,CCl₃COCH₃ and C₆H₅COCl, respectively.

(c) A characteristic test for carbonyl gp., red salt is formed.

(c) Hydrocarbons are oxidised to aldehydes because only these two are present in atmosphere.

(b) $—\underset{\mathrm{H}}{\underset{|}{\mathrm{C}}}=\mathrm{O}$

(a) CH₃CH₂OH $\stackrel{{\mathrm{Cl}}_2}{\to }$CH₃CHO $\stackrel{{\mathrm{Cl}}_2}{\to }$CCl₃CHO

(d) All aldehydes and methyl ketones give this reaction.

(b) Acetophenone is hypnotic agent and called hypnone in medicinal use.

(c) Collin's reagent (CrO₃-pyridine) converts $2°$ alcohol to ketone and $1°$$$alcohol to aldehyde.