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Chemistry · 2022 · 3 marks
CBSE 2022 · Region 4 · Set 1 · Q9
(a) Write equations involved in the following reactions: (i) Ethanamine reacts with acetyl chloride. (ii) Aniline reacts with bromine water at room…
(a)
Write equations involved in the following reactions :
(i)
Ethanamine reacts with acetyl chloride.
(ii)
Aniline reacts with bromine water at room temperature.
(iii)
Aniline reacts with chloroform and ethanolic potassium hydroxide.
OR
(b)(i)
Write the IUPAC name for the following organic compound : $\displaystyle \left(\mathrm{CH}_{3} \mathrm{CH}_{2}\right)_{2} \mathrm{NCH}_{3}$
(ii)
Write the equations for the following :
(I)
Gabriel phthalimide synthesis
(II)
Hoffmann bromamide degradation
Marking-scheme solution
(i)
$\displaystyle \mathrm{C_2H_5NH_2 + CH_3COCl} \xrightarrow{\text{Base}} \mathrm{C_2H_5NHCOCH_3} + \mathrm{HCl}$
(ii)
$\displaystyle \xrightarrow{\mathrm{Br_2/H_2O}}$ $\displaystyle +\ 3\mathrm{HBr}$
(iii)
$\displaystyle +\ \mathrm{CHCl_3} + 3\mathrm{KOH}$ $\displaystyle \xrightarrow{\text{heat}}$ $\displaystyle +\ 3\mathrm{H_2O} + 3\mathrm{KCl}$
(i)
N-Ethyl-N-methylethanamine
(ii)
(I)
$\displaystyle \xrightarrow{\mathrm{KOH}}$ $\displaystyle \xrightarrow{\mathrm{R-X}}$ $\displaystyle \xrightarrow{\mathrm{NaOH}}$ R—NH$\displaystyle _2$ +
(II)
$\displaystyle \mathrm{CH_3-\overset{\displaystyle O}{\overset{\displaystyle\|}{C}}-NH_2} + \mathrm{Br_2} + 4\,\mathrm{NaOH} \longrightarrow \mathrm{CH_3NH_2} + \mathrm{Na_2CO_3} + 2\,\mathrm{NaBr} + 2\,\mathrm{H_2O}$
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.