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Chemistry · 2024 · 3 marks
CBSE 2024 · Region 4 · Set 1 · Q27
(a) Write the IUPAC name of the given compound: (b) The presence of - NO_2 group at ortho or para position increases the reactivity of haloarenes…
(a)
Write the IUPAC name of the given compound :
(b)
The presence of $\displaystyle -\mathrm{NO}_{2}$ group at ortho or para position increases the reactivity of haloarenes towards nucleophilic substitution reactions. Give reason to explain the above statement.
(c)
What happens when ethyl chloride is treated with alcoholic potassium hydroxide ? $\displaystyle 1$ × $\displaystyle 3$
Marking-scheme solution
(a) $\displaystyle 3$ - Bromo- $\displaystyle 1$ - chlorocyclohexene
(b) Nitro group is electron withdrawing group, it withdraws electron density from the benzene ring and facilitates the attack of nucleophile on haloarene.
(c) \(\displaystyle \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{Cl}+\mathrm{KOH}(\mathrm{alc}) \longrightarrow \mathrm{CH}_{2}=\mathrm{CH}_{2}+\mathrm{KCl}+\mathrm{H}_{2} \mathrm{O} /\) Ethene is formed.
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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.