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Why is NH(2) group of aniline acetylated...

Why is `NH_(2)` group of aniline acetylated before carrying our nitration

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In order to check the activation of benzene ring by amino group, first it is acetylated with acetic anhydride or acetyl chloride in presence to form acetanilide which can be further nitralised easily by the nitrating mixture.
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Why is nitric acid added to sodium extract before adding silver nitrate for testing halogens?

The -NO_(2) group in an aromatic ring deactivates the ortho and para positions for an electrophilic attack. When -NO_(2) group is present at ortho or para positions of a leaving group (Nucleofuge) it activates the ring for nucleophilic attack. The reduction of -NO_(2) group by metal in acid causes its reduction to -NH_(2) group and then the ring becomes strongly activated for a electrophilic attack. The strong activation of -NH_(2) group is moderated by its acylation with CH_(3)COCl to -NHAc group. Deacylation is carried out by hydrolysis with H_(3)O^(+) or OH^(-) . The ring alkylation by using RX//AlX_(3) is not possible in presence of -NO_(2) or -NH_(2) group but is possible in presence of -NHAc group. The product (I) is :

The -NO_(2) group in an aromatic ring deactivates the ortho and para positions for an electrophilic attack. When -NO_(2) group is present at ortho or para positions of a leaving group (Nucleofuge) it activates the ring for nucleophilic attack. The reduction of -NO_(2) group by metal in acid causes its reduction to -NH_(2) group and then the ring becomes strongly activated for a electrophilic attack. The strong activation of -NH_(2) group is moderated by its acylation with CH_(3)COCl to -NHAc group. Deacylation is carried out by hydrolysis with H_(3)O^(+) or OH^(-) . The ring alkylation by using RX//AlX_(3) is not possible in presence of -NO_(2) or -NH_(2) group but is possible in presence of -NHAc group. The product (G) is :

The -NO_(2) group in an aromatic ring deactivates the ortho and para positions for an electrophilic attack. When -NO_(2) group is present at ortho or para positions of a leaving group (Nucleofuge) it activates the ring for nucleophilic attack. The reduction of -NO_(2) group by metal in acid causes its reduction to -NH_(2) group and then the ring becomes strongly activated for a electrophilic attack. The strong activation of -NH_(2) group is moderated by its acylation with CH_(3)COCl to -NHAc group. Deacylation is carried out by hydrolysis with H_(3)O^(+) or OH^(-) . The ring alkylation by using RX//AlX_(3) is not possible in presence of -NO_(2) or -NH_(2) group but is possible in presence of -NHAc group. The product (H) is :

Direct nitration of aniline is not carried out. Explain why?

Why does -NH_2 group directs the incoming group at the ortho and para positions of the ring?

Give reasons for the following (a) Acetylation of aniline reduces its activation effect. (b) CH_(3)NH_(2) is more basic than C_(6)H_(5)NH_(2) . (c) Although -NH_(2) is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.

Give reasons for the following (a) Acetylation of aniline reduces its activation effect. (b) CH_(3)NH_(2) is more basiic than C_(6)H_(5)NH_(2) . (c) Although -NH_(2) is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline.

Why is NH_(4)Cl essential in the precipitation of group V cations?

In case of meta-attack on aniline (where -NH_(2) group is o-, p- directing) and in case of ortho-attack on nitrobenzene, resonating structures are possible. Which of them are more stable ?

NCERT EXEMPLAR ENGLISH-AMINES-SATQ
  1. What is the role of HNO(3) in the nitrating mixture used for nitration...

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  2. Why is NH(2) group of aniline acetylated before carrying our nitration

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  3. What is the product when C(6)H(5)CH(2)NH(2) reacts with HNO(3)?

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  4. What is the best reagent to convert nitrile to primary amine

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  5. Give the structure of 'A' in the following reaction.

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  6. What is Hinsberg reagent?

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  7. Why is benzene diazonium chloride not stored and is used immediately a...

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  8. Why does acylation of -NH(2) of aniline reduces its activating effect?

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  9. Explain why MeNH(2) is stronger base than MeOH?

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  10. What is the role of pyridine in the acelation reaction of amines?

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  11. Under the reaction condition (acidic, basic) the coupling reaction of ...

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  12. Predict the product of reaciton for aniline with bromine in non-polar...

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  13. Arraange the following compounds in increasing order of dipole moment?...

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  14. What is the structure and IUPAC name of the compound, allyl amine?

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  15. Write down the IUPAC name of

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  16. A compound Z with molecular formula C(3)H(9)N reacts with C(6)H(5)SO(2...

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  17. A primary amine, RNH(2) can be reacted with CH(3)-X to get secondary a...

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  18. Complete the following reaction

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  19. Why is aniline soluble in aqueous HCl?

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  20. Suggest a route by which of the following conversion can be accomplish...

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