CBSE 2025, Set 1

Question

How do you convert:

(a) Chlorobenzene to biphenyl

(b) Propene to 1-iodopropane

(c) 2-bromobutane to but-2-ene

Edvaya · Accepted Answer

The correct answer is Subjective. ![Q26B conversion schemes](https://www.edvaya.com/images/chemistry/cbse/2025/set1/q26b-answer-conversions.webp) **(a) Chlorobenzene $ightarrow$ Biphenyl (Fittig reaction):** $$2\,	ext{C}_6	ext{H}_5	ext{Cl} \xrightarrow{2	ext{Na, dry ether}} 	ext{C}_6	ext{H}_5	ext{–C}_6	ext{H}_5 + 2	ext{NaCl}$$ *(Note: Wurtz-Fittig is for an alkyl halide reacting with an aryl halide. The reaction of two aryl halides is the Fittig reaction.)* **(b) Propene $ightarrow$ 1-Iodopropane:** $$	ext{CH}_3	ext{CH=CH}_2 \xrightarrow{	ext{HBr, peroxide}} 	ext{CH}_3	ext{CH}_2	ext{CH}_2	ext{Br} \xrightarrow{	ext{NaI/acetone}} 	ext{CH}_3	ext{CH}_2	ext{CH}_2	ext{I}$$ (Anti-Markovnikov addition, then Finkelstein reaction) **(c) 2-Bromobutane $ightarrow$ But-2-ene (Dehydrohalogenation):** $$	ext{CH}_3\underset{|}{\overset{	ext{Br}}{	ext{CH}}}	ext{CH}_2	ext{CH}_3 \xrightarrow{	ext{alc. KOH},\,\Delta} 	ext{CH}_3	ext{CH=CHCH}_3 + 	ext{HBr}$$

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Chemistry > Organic Chemistry > Haloalkanes And Haloarenes

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