CBSE 2023 · Region 2 · Set 1 · Q24 · 2 marks
Do the following conversions in not more than two steps: $\displaystyle \mathbf{2} \boldsymbol{\times} \mathbf{1}$(a)$\displaystyle \mathrm{CH}_{3} \mathrm{CN}$ to to $\displaystyle \underset{=\underset{=}{\mathrm{C}}-\mathrm{CH}_{3}}{ }$(b)$\displaystyle \langle-\mathrm{COOH}$ to 〈
Do the following conversions in not more than two steps: $\displaystyle \mathbf{2} \boldsymbol{\times} \mathbf{1}$
(a)
$\displaystyle \mathrm{CH}_{3} \mathrm{CN}$ to to $\displaystyle \underset{=\underset{=}{\mathrm{C}}-\mathrm{CH}_{3}}{ }$
(b)
$\displaystyle \langle-\mathrm{COOH}$ to 〈
Marking-scheme solution
(a)
CH₃CN —(CH₃MgBr / Dry ether)→ CH₃–C(=NMgBr)–CH₃ —(H₂O / H⁺)→ CH₃–C(=O)–CH₃
(b)
C₆H₅–COOH —(NaOH)→ C₆H₅–COONa —(NaOH + CaO, Δ)→ C₆H₆ (benzene)
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CBSE Class 12 Chemistry past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.