Plus Two Chemistry Notes Chapter 13 Amines is part of Plus Two Chemistry Notes. Here we have given Plus Two Chemistry Notes Chapter 13 Amines.
|Text Book||NCERT Based|
|Category||Plus Two Kerala|
Kerala Plus Two Chemistry Notes Chapter 13 Amines
- They are derivatives of NH3
- Types of amines
1. Primary Amines (R-NH2):
UPACname → alkanamine
2. Secondary Amines (R2-NH):
3. Tertiary Amines (R3-N):
The IUPAC name of the compound
Which of the following is a 3° amine?
c. tert – butylamine
d. N – methylaniline
Basicity of Amines
1. In gases: 3° > 2° > 1° > NH3 > Anhline (321 NA)
2. In aqueous solution:
If R > CH3 ⇒ 2° > 3° > 1° > NH3 > Aniline (231 NA)
If R = CH3 ⇒ 2° > 1° > 3° > NH3 > Aniline (213 NA)
This change is due to steric hindrance,+l effect.
Note: Basicity ↑ ⇒ Kb ↑ ; PK b↓
Which of the following ¡s most basic?
d. p – Nitroanhllne
The basic character otan amine Is due to presence of…… on nitrogen atom.
a lone pair of electrons
Preparation of Amines
1. From nitro compounds:
2. From Alkyl halides:
3. From Cyanides:
4. From Amides (RCONH2):
5. Gabriel phthalimide synthesis:
Amine that cannot be preapred by Gabriel phthalimide synthesis is
d. tertiary- butylamine
3. Carbylamine reaction:
Primary amines react with chloroform and NaOH/KOH to give a foul smell (isocyanide).
Note: This reaction is also done by aromatic 1 amines.
4. Reaction with HNO2:
- 1° amines + Hinsberg reagent → reacts with NaOH
- 2° amines + Hinsberg reagent → product does not reacts with NaOH
- 3° amines + Hinsberg reagent → no reaction occurs.
Reactions of Aniline
Aniline undergoes electrophilic substitution reaction at o, p (2, 4, 6) positions.
Direct nitration of aniline by using conc.HNO3 + H2SO4 is always avoided because of formation of tarry oxidation product (due to the formation of anilinium ion).
Nitration is conducted indirectly. The steps are:
Some other reactions:
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