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Chemistry · 2024 · 2 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids2 marksApplyvery short answer
CBSE 2024 · Region 1 · Set 2 · Q19
Write the chemical equations when: (a) Pentan-3-one is treated with H_2 N - NH_2 followed by heating with KOH in high boiling solvent such as…
Write the chemical equations when :
(a)
Pentan-$\displaystyle 3$-one is treated with $\displaystyle \mathrm{H}_{2} \mathrm{~N}-\mathrm{NH}_{2}$ followed by heating with KOH in high boiling solvent such as ethylene glycol.
(b)
Two molecules of $\displaystyle \left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{CHO}$ are treated with conc. NaOH .
Marking-scheme solution
(a)
$\displaystyle \mathrm{CH_3-CH_2-\underset{\substack{\|\\ \mathrm{O}}}{C}-CH_2-CH_3} \xrightarrow[\text{KOH, Glycol}]{\mathrm{H_2N-NH_2}} \mathrm{CH_3-CH_2-CH_2-CH_2-CH_3}$
(b)
$\displaystyle 2(\mathrm{CH_3})_3\mathrm{C-CHO} \xrightarrow{\text{Conc. NaOH}} (\mathrm{CH_3})_3\mathrm{C\text{-}COO^-Na^+} + (\mathrm{CH_3})_3\mathrm{C-CH_2-OH}$
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