✓ Board-verified
Chemistry · 2022 · 3 marks
CBSE 2022 · Region 4 · Set 1 · Q4
(a) Write reasons for the following: (i) Ethylamine is soluble in water whereas aniline is insoluble. (ii) Amino group is o - and p -directing in…
(a)
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.
OR
(b)
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)
$\displaystyle \mathrm{CH_3CN} \xrightarrow{\mathrm{LiAlH_4}} \mathrm{CH_3CH_2NH_2}$
More from Amines
- Assertion: Acetanilide ( -NHCOCH_3 ) is less basic than aniline. Reason (R): Acetylation of aniline results in decrease of electron density on…2024 · asked 2×
- Among the following, which is the strongest base?2023 · asked 2×
- Which of the following is least basic?2023
- Assertion: Aliphatic primary amines can be prepared by Gabriel phthalimide synthesis. Reason (R): Alkyl halides undergo nucleophilic substitution…2024
- How will you obtain the following from benzene diazonium chloride? Write chemical equations involved: 3 []2026
- A compound 'A' on reduction with iron scrap and hydrochloric acid gives compound 'B' with molecular formula C_6 H_7 N. Compound 'B' on reaction with…2022
- Assertion: Aniline is a stronger base than ammonia. Reason (R): The unshared electron pair on nitrogen atom in aniline becomes less available for…2024
- Identify the primary amine from the given options:2024
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.