CBSE 2025, Set 2

Question

How will you convert the following:

(i) Toluene to benzoic acid

(ii) Ethanol to propan-2-ol

(iii) Propanal to 2-hydroxypropanoic acid

Edvaya · Accepted Answer

The correct answer is Subjective. **(i) Toluene → Benzoic acid:** ![Toluene to benzoic acid via KMnO₄ oxidation](https://www.edvaya.com/images/chemistry/cbse/2025/set2/q32a-iii-toluene-benzoic-acid.webp) $$	ext{C}_6	ext{H}_5	ext{CH}_3 \xrightarrow{	ext{KMnO}_4/	ext{KOH, Heat}} 	ext{C}_6	ext{H}_5	ext{COOK} \xrightarrow{	ext{H}_3	ext{O}^+} 	ext{C}_6	ext{H}_5	ext{COOH}$$ **(ii) Ethanol → Propan-2-ol:** $$	ext{CH}_3	ext{CH}_2	ext{OH} \xrightarrow{	ext{PCC}} 	ext{CH}_3	ext{CHO} \xrightarrow{1.\,	ext{CH}_3	ext{MgBr}} \xrightarrow{2.\,	ext{H}_3	ext{O}^+} 	ext{CH}_3	ext{CH(OH)CH}_3$$ (Oxidise ethanol to ethanal, then Grignard reaction with methylmagnesium bromide gives propan-2-ol) **(iii) Propanal → 2-Hydroxypropanoic acid (lactic acid):** $$	ext{CH}_3	ext{CH}_2	ext{CHO} \xrightarrow{	ext{KMnO}_4/	ext{H}^+} 	ext{CH}_3	ext{CH}_2	ext{COOH} \xrightarrow{	ext{Cl}_2/	ext{Red P}} 	ext{CH}_3	ext{CH(Cl)COOH} \xrightarrow{	ext{NaOH(aq)}} 	ext{CH}_3	ext{CH(OH)COOH}$$

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Chemistry > Organic Chemistry > Aldehydes Ketones And Carboxylic Acids

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