Amines
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New answer posted
4 months agoContributor-Level 10
This is a Short Type Questions as classified in NCERT Exemplar
Ans: The best reagents for the conversion of nitrile to primary amine are LiAlH4 and Sodium/Alcohol. By reduction, the nitriles can be converted into a corresponding primary amine.
New answer posted
4 months agoContributor-Level 10
This is a Short Type Questions as classified in NCERT Exemplar
Ans: When Benzyl amine is treated with nitrous acid, firstly BDC is formed which is unstable and decomposes to Benzyl alcohol.
New answer posted
4 months agoContributor-Level 10
This is a Short Type Questions as classified in NCERT Exemplar
Ans:
Direct nitration of aniline is not possible on account of oxidation of -NH2 group. However, nitration can be carried after protecting the -NH2 group by acetylation to give acetanilide which is then nitrated and finally hydrolysed to give o- and p-nitroanilines.
The acetyl group being electron withdrawing attracts the lone pair of electrons of the N-atom towards carbonyl group.
As a result, the activating effect -NH2 group is reduced i.e., the lone pair of electrons on nitrogen is less available for donation to benzene ring by resonance. Therefore, acti
New answer posted
4 months agoContributor-Level 10
This is a Short Type Questions as classified in NCERT Exemplar
Ans: HNO3 acts as a base in the nitrating mixture (HNO3 + H2SO4) and provides the electrophile.
New answer posted
4 months agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option (A and B)
Benzene diazonium chloride reacts with phenol to form p-hydroxy azobenzene by coupling the phenol molecule at its para position with the diazonium salt. This is referred to as a coupling reaction. This is an illustration of an electrophilic substitution reaction.
At room temperature, aniline reacts with bromine water to form a white precipitate of 2,4,6-tribromoaniline.
By acetylation with acetic anhydride to protect the −NH2 group, then carrying out the desired substitution followed by hydrolysis of the substituted amide to the substi
New answer posted
4 months agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: a and b
In addition to the nitro derivatives, direct nitration of aniline produces tarry oxidation products. Furthermore, aniline is protonated in the strongly acidic medium to form the anilinium ion, which is meta directing. As a result, in addition to the ortho and para derivatives, a significant amount of meta derivative is formed.
However, by protecting the? NH2 group with an acetylation reaction with acetic anhydride, the nitration reaction can be controlled and the p-nitro derivative obtained as the main product.
New answer posted
4 months ago
Contributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: option a and c
(a) Primary alkyl halides react with ammonia to give primary amines. Correct reaction.
(B) Elimination process doesn't occur with aq. KOH, hydrolysis process takes place. (B) is incorrect.
(c) Dehydrohalogenation I.e. elimination of HCl occurs which produces alkene as the product takes place with alc. KOH . (c) is correct.
(d) In this reaction, aliphatic primary amines, on treatment with nitrous acid, produce primary alcohol as a product.
Therefore (d) is incorrect.
New answer posted
4 months agoContributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: (a and b)
Gabriel synthesis is a method for producing primary amines. When phthalimide is treated with ethanolic potassium hydroxide, it forms a potassium salt of phthalimide, which when heated with an alkyl halide and then alkaline hydrolyzed yields the corresponding primary amine.
New answer posted
4 months ago
Contributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: A, B & C
As the NH2 group is Ortho para directing group, so Br+ attacks only at the o and p positions thus the products formed corresponds to the option A, B and C.
New answer posted
4 months ago
Contributor-Level 10
This is a Multiple Choice Questions as classified in NCERT Exemplar
Ans: Option a and b
NHCOCH3 is an ortho- para directing group so ortho-para products are formed.
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