Aliphatic amines are more basic in nature than aromatic amines because In aliphatic amines the electron density around N atom increases due to - I effect of alky group and thus chance for proton attack also Increases. Since alcohols are much stronger acids than amines, their conjugate bases are weaker than amide bases, and fill the gap in base strength between amines and amide salts. (b, Aromatic amines such as aniline in general are weaker bases than aliphatic amines such as cyclohexan amine. Therefore, aromatic amines are weaker bases than ammonia and aliphatic amines. (iii) Why are aliphatic amines stronger bases than aromatic amines? Primary aliphatic amines are stronger bases than ammonia which is a stronger base than aromatic amines. Aromatic amines are lesser basic than aliphatic amines.why ? 3. This explains why aliphatic amines are stronger bases than aromatic amines. On the other hand, aromatic amines are weaker bases than ammonia due to the electron withdrawing nature of the aryl group. (iii) Due to the −R effect of the benzene ring, the electrons on the N- atom are less available in case of aromatic amines. More Resources for CBSE Class 12: (a, Aqueous solutions of amines are basic. Therefore, the electrons on the N-atom in aromatic amines cannot be donated easily. R-NH 2 --> R – N-H + H + Amide ion. Answer: Amines undergo protonation to give amide ion. In the following table, pK a again refers to the conjugate acid of the base drawn above it. Water-insoluble amines react with strong aqueous acids such as HC1 to form water- soluble salts. Their pK b values lie in the range of 3 to 4.22. Explain why. Why are aliphatic amines stronger bases than aromatic amines? o … Similarly, alcohol loses a proton to give alkoxide ion. Why is the aliphatic amine a stronger base than the aromatic amide? Aromatic amines due to resonance effect and lower stability of aryl ammonium ion than aryl amine, e- density on N is less. Therefore, the electrons on the N-atom in aromatic amines cannot be donated easily. NCERT Solutions for Class 12 Chemistry All Chapters Answer: Alkyl amines has positive I effect/electron donating effect, so high electron density on N and stable alkyl ammonium ion formation. The more available the lone pair of electrons, the stronger the base. This explains why aliphatic amines are stronger bases than aromatic amines. Most base reagents are alkoxide salts, amines or amide salts. The benzene ring draws electrons towards itself and the nitrogen lone pair gets partially delocalised onto the benzene ring. (b) Aromatic amines arS more stable than corresponding protonated ion; Hence, they hag very less tendency to combine with a proton to form corresponding protonated ion, and thus they are less basic. Structure-basicity relationship of amines
(ii) Why do primary amines have higher boiling point than tertiary amines? (iii) Due to the −R effect of the benzene ring, the electrons on the N- atom are less available in case of aromatic amines. R-OH --> R- O- + H + Alcohol Alkoxide ion.
(iii) Why are aliphatic amines stronger bases than aromatic amines? All aliphatic amines are strong bases than NH 3 while aromatic amines are weaker bases than NH 3 due to the electron withdrawing nature of the aryl group. Aliphatic amines are stronger bases than inorganic bases such as NaOH and KOH. In aromatic amines, lone pair of nitrogen is in resonance and hence not available to nitrogen atom itself and hence it acts as a weak base. 1 See answer HIRESHYADAV6671 is waiting for your help. Aliphatic amines are stronger bases than ammonia due to +I effect of alkyl groups leading to high electron density on the nitrogen atom. HIRESHYADAV6671 HIRESHYADAV6671 13.01.2019 Chemistry Secondary School Why are aliphatic amines stronger bases than aromatic amines? Give plausible explanation for each of the following:
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