CBSE 2022 · Region 4 · Set 1 · Q4 · 3 marks
Write reasons for the following :(i)Ethylamine is soluble in water whereas aniline is insoluble.(ii)Amino group is $\displaystyle o$ - and $\displaystyle p$-directing in aromatic electrophilic substitution reactions, but aniline on nitration gives a substantial amount of $\displaystyle m$-nitroaniline.(iii)Amines behave as nucleophiles.How will you carry out the following conversions :(i)Nitrobenzene to Aniline(ii)Ethanamide to Methanamine(iii)Ethanenitrile to Ethanamine
Write reasons for the following :
(i)
Ethylamine is soluble in water whereas aniline is insoluble.
(ii)
Amino group is $\displaystyle o$ - and $\displaystyle p$-directing in aromatic electrophilic substitution reactions, but aniline on nitration gives a substantial amount of $\displaystyle m$-nitroaniline.
(iii)
Amines behave as nucleophiles.
How will you carry out the following conversions :
(i)
Nitrobenzene to Aniline
(ii)
Ethanamide to Methanamine
(iii)
Ethanenitrile to Ethanamine
Marking-scheme solution
(a) (i)Ethylamine forms strong hydrogen bonds with water molecules whereas in aniline due to the large hydrocarbon part, the extent of H-bonding decreases.
(ii) Because of protonation of aniline / formation of anilinium ion which deactivates the ring.
(iii) Amines behaves as nucleophiles due to the presence of a lone pair of electrons on the nitrogen atom.
(b)
$\displaystyle \xrightarrow{\mathrm{Fe/HCl}}$
(ii)
$\displaystyle \mathrm{CH_3CONH_2} \xrightarrow{\mathrm{Br_2/KOH}} \mathrm{CH_3NH_2}$
(iii)
$\displaystyle \mathrm{CH_3CN} \xrightarrow{\mathrm{LiAlH_4}} \mathrm{CH_3CH_2NH_2}$
AminesChemical Reactions of AminesUnderstandshort_answermedium
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CBSE Class 12 Chemistry past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.