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Chemistry · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 3 · Q27
(a) Write the IUPAC name of the given compound: CH_2= CH - CH_2- CH_2- Cl (b) Why is thionyl chloride preferred for preparing alkyl halides from…
(a)
Write the IUPAC name of the given compound : \[\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{Cl} \]
(b)
Why is thionyl chloride preferred for preparing alkyl halides from alcohols ?
(c)
What happens when Methyl bromide reacts with KCN ? $\displaystyle \mathbf{1} \boldsymbol{\times} \mathbf{3}$
Marking-scheme solution
(a) $\displaystyle 4$-Chlorobut-$\displaystyle 1$-ene
(b) Because two gaseous products \(\displaystyle \mathrm{SO}_{2}\) and HCl are escapable, hence pure alkyl halides are obtained.
(c) \(\displaystyle \mathrm{CH}_{3}-\mathrm{Br}+\mathrm{KCN} \longrightarrow \mathrm{CH}_{3} \mathrm{CN}+\mathrm{KBr} /\) Methyl cyanide / Ethane nitrile
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CBSE Class 12 Chemistry past-paper question from the 2024 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.