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CBSE 12th Standard Chemistry Subject Haloalkanes and Haloarenes Ncert Exemplar Fill Ups Questions 2021

Published on: 25/05/2021

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Std: 12th Standard CBSE - Chemistry

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Questions:

Generic 2

4 x 2 = 8

Which is a better nucleophile, a bromide ion or an idodide ion ?

Organic halogon compounds used in industry as solvents are chlorides rather than bromides and iodides. Explain

How will you obtain 1-bropropane from propane ?

Explain why thionyl chloride method is preferred for preparing alkyl chlorides from alcols?

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Answers Key:

Generic 2

4 x 2 = 8

Because of bigger size and lower electronegativity, iodide ion can donate a pair of electrons more easily than bromide ion and hence iodide ion is a better nucleophile than bromide ion.

Organic alkyl chlorides are widely used as solvents in industry because chlorides are not only more stable but are also more volatile than bromides and iodides.

With HBr in presence of perxides \(\left(\mathrm{CH}_3 \mathrm{CH}=\mathrm{CH}_2 \stackrel{\text { HBr.peroxides }}{\longrightarrow} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Br}\right)\)

Because the products of the reaction. i.e., SO₂ and HCI being gases escape into the atmosphere leaving behind alkyl chorides in almost pure state.