How can tri substitution of Bromine be prevented in aniline ? OR How can we prepare mono bromo aniline ?

How can tri substitution of Bromine be prevented in aniline ? OR How can we prepare mono bromo aniline ?
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Answer :

Because of high reactivity of aromatic amines substitution tends to occur at o- and ppositions. Monosubstituted aniline can be prepared by protecting — NH2 group by acetylation with acetic anhydride, then carrying out substitution followed by hydrolysis of substituted amide.

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Pkb of aniline is more than that of methyl amine.

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Although — NH2 gp is an ortho and para directing gp, nitration of aniline gives along with ortho and para, meta derivatives also.

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Benzenediazonium chloride reacts with hypophosphorus acid to form : (a) Phenol (b) Benzaldehyde (c) Aniline (d) Benzene

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Last Answer : Benzene

Chlorobenzene can be prepared by treatment of aniline with (a) Cuprous chloride (b) Chlorine in the presence of UV light (c) Nitrous acid followed by treatment with CuCl (d) Chlorine in the presence of FeCl3

Description : Chlorobenzene can be prepared by treatment of aniline with (a) Cuprous chloride (b) Chlorine in the presence of UV light (c) Nitrous acid followed by treatment with CuCl (d) Chlorine in the presence of FeCl3

Last Answer : Nitrous acid followed by treatment with CuCl

Bromobenzene can be prepared by treating aniline with (a) Conc HBr (b) Br2/FeBr3 (b) CuBr (d) Nitrous acid then CuBr

Description : Bromobenzene can be prepared by treating aniline with (a) Conc HBr (b) Br2/FeBr3 (b) CuBr (d) Nitrous acid then CuBr

Last Answer : Nitrous acid then CuBr

Benzenediazonium chloride reacts with warm water to give (a) Aniline (b) Phenol (c) Benzene (d) Chlorobenzene

Description : Benzenediazonium chloride reacts with warm water to give (a) Aniline (b) Phenol (c) Benzene (d) Chlorobenzene

Last Answer : Phenol

Which of the following are optimum temperature conditions for making benzenediazonium chloride from aniline? (a) 0°C to 10°C (b) 20°C to 25°C (c) 30°C to 40°C (d) 45°C to 50°C

Description : Which of the following are optimum temperature conditions for making benzenediazonium chloride from aniline? (a) 0°C to 10°C (b) 20°C to 25°C (c) 30°C to 40°C (d) 45°C to 50°C

Last Answer : 0°C to 10°C

Which of the following compounds is most basic? (a) Aniline (b) Benzylamine (c) Acetanilide (d) p-nitroaniline

Description : Which of the following compounds is most basic? (a) Aniline (b) Benzylamine (c) Acetanilide (d) p-nitroaniline

Last Answer : Benzylamine

Which of the following reagents does not react with aniline? (a) Acetyl chloride (b) Acetic anhydride (c) Ammonia (d) Nitrous acid

Description : Which of the following reagents does not react with aniline? (a) Acetyl chloride (b) Acetic anhydride (c) Ammonia (d) Nitrous acid

Last Answer : Ammonia

Aniline undergoes oxidation with Na2Cr2O7/H2SO4 to give (a) Schiff's base (b) p-Benzoquinone (c) Phenol (d) Benzoic acid

Description : Aniline undergoes oxidation with Na2Cr2O7/H2SO4 to give (a) Schiff's base (b) p-Benzoquinone (c) Phenol (d) Benzoic acid

Last Answer : p-Benzoquinone

Aniline reacts with acetic anhydride to give : (a) N-Methylaniline (b) p-Aminoacetophenone (c) Acetanilide (d) m-Aminoacetophenone

Description : Aniline reacts with acetic anhydride to give : (a) N-Methylaniline (b) p-Aminoacetophenone (c) Acetanilide (d) m-Aminoacetophenone

Last Answer : Acetanilide

When aniline is heated with chloroform and alcoholic KOH, the product is (a) Benzonitrile (b) p-Chloroaniline (c) Phenylisocyanide (d) m-Chloroaniline

Description : When aniline is heated with chloroform and alcoholic KOH, the product is (a) Benzonitrile (b) p-Chloroaniline (c) Phenylisocyanide (d) m-Chloroaniline

Last Answer : Phenylisocyanide

Aniline reacts with nitrous acid at low temperatures to give (a) a N-nitrosoamine (b) a nitrile (c) a diazonium salt (d) a nitrite salt

Description : Aniline reacts with nitrous acid at low temperatures to give (a) a N-nitrosoamine (b) a nitrile (c) a diazonium salt (d) a nitrite salt

Last Answer : a diazonium salt

Benzamide reacts with Br2 and KOH to give (a) Benzene (b) Benzylamine (c) Aniline (d) Benzonitrile

Description : Benzamide reacts with Br2 and KOH to give (a) Benzene (b) Benzylamine (c) Aniline (d) Benzonitrile

Last Answer : Benzylamine

Aniline is prepared by (a) the reaction of benzene with ammonia (b) the reduction of nitrobenzene with Sn/HCl (c) the dehydrogenation of nitrobenzene (d) the reaction of nitrobenzene with I2/NaOH

Description : Aniline is prepared by (a) the reaction of benzene with ammonia (b) the reduction of nitrobenzene with Sn/HCl (c) the dehydrogenation of nitrobenzene (d) the reaction of nitrobenzene with I2/NaOH

Last Answer : the reduction of nitrobenzene with Sn/HCl

Which of the following statements is correct about aniline? (a) is weak acid. (b) diazotizes to benzenediazonium chloride when treated with ice-cold nitrous acid. (c) can be nitrated with concentrated HNO3 to form p-nitroaniline. (d) gives an intense green color with a suspension of bleaching powder in water

Description : Which of the following statements is correct about aniline? (a) is weak acid. (b) diazotizes to benzenediazonium chloride when treated with ice-cold nitrous acid. (c) can be nitrated with ... p-nitroaniline. (d) gives an intense green color with a suspension of bleaching powder in water

Last Answer : diazotizes to benzenediazonium chloride when treated with ice-cold nitrous acid.

Which of the following statements is false about aniline? (a) It is a primary aromatic amine. (b) It is a weak base which forms salts with acids. (c) It liberates nitrogen on treatment with ice-cold nitrous acid. (d) It can be prepared by the reduction of nitrobenzene with tin and HCl

Description : Which of the following statements is false about aniline? (a) It is a primary aromatic amine. (b) It is a weak base which forms salts with acids. (c) It liberates nitrogen on treatment with ice-cold nitrous acid. (d) It can be prepared by the reduction of nitrobenzene with tin and HCl

Last Answer : It liberates nitrogen on treatment with ice-cold nitrous acid

Nitrobenzene undergoes reduction with zinc and KOH to give (a) Aniline (b) Hydrazobenzene (c) Azobenzene (d) None of these

Description : Nitrobenzene undergoes reduction with zinc and KOH to give (a) Aniline (b) Hydrazobenzene (c) Azobenzene (d) None of these

Last Answer : Hydrazobenzene

Which of the following statements is False/Incorrect about nitrobenzene? (a) is formed by nitration of benzene at temperatures below 60°C. (b) can be further nitrated to give m-dinitrobenzene. (c) can be oxidized with KMnO4 to give benzoic acid. (d) can be reduced with Sn/HCl to give aniline.

Description : Which of the following statements is False/Incorrect about nitrobenzene? (a) is formed by nitration of benzene at temperatures below 60°C. (b) can be further nitrated to give m-dinitrobenzene. (c) can be oxidized with KMnO4 to give benzoic acid. (d) can be reduced with Sn/HCl to give aniline.

Last Answer : can be oxidized with KMnO4 to give benzoic acid

Which of the following compounds does not react with acetyl chloride? (a) Methylamine (b) Dimethylamine (c) Aniline (d) Trimethylamine

Description : Which of the following compounds does not react with acetyl chloride? (a) Methylamine (b) Dimethylamine (c) Aniline (d) Trimethylamine

Last Answer : Trimethylamine

Which of the following is least soluble in water? (a) Methylamine (b) Trimethylamine (c) Dimethylamine (d) Aniline

Description : Which of the following is least soluble in water? (a) Methylamine (b) Trimethylamine (c) Dimethylamine (d) Aniline

Last Answer : Methylamine