CBSE Class 12 Chemistry HOTs Animes

Please refer to CBSE Class 12 Chemistry HOTs Animes. Download HOTS questions and answers for Class 12 Chemistry. Read CBSE Class 12 Chemistry HOTs for Unit 13 Amines below and download in pdf. High Order Thinking Skills questions come in exams for Chemistry in Class 12 and if prepared properly can help you to score more marks. You can refer to more chapter wise Class 12 Chemistry HOTS Questions with solutions and also get latest topic wise important study material as per NCERT book for Class 12 Chemistry and all other subjects for free on Studiestoday designed as per latest CBSE, NCERT and KVS syllabus and pattern for Class 12

Unit 13 Amines Class 12 Chemistry HOTS

Class 12 Chemistry students should refer to the following high order thinking skills questions with answers for Unit 13 Amines in Class 12. These HOTS questions with answers for Class 12 Chemistry will come in exams and help you to score good marks

HOTS Questions Unit 13 Amines Class 12 Chemistry with Answers

 

VERY SHORT ANSWER TYPE QUESTIONS 

Question. Write IUPAC name of CH3NC.
Answer.
Methane carbylamine.


Question. Convert m-dinitrobenzene to m-nitro aniline.
Answer.

Amines 10


Question. Draw structure of TNT, an explosive.
Answer.
Amines 11


Question. Write IUPAC name of
Amines 12

Answer. 3-Methyl-N,N-dimethyl pentanamine


Question. Give one use of quaternary ammonium salts.
Answer.
It is used as detergents, e.g., [CH3(CH2)15N(CH3)2]+Cl.


Question. What is Hinsberg’s reagent ?
Answer.
Benzene sulphonyl chloride,
Amines 13


Question. Why aniline dissolves in HCl ?
Answer. C6H5NH2 + HCl → [C6H5NH3]+Cl.
It dissolves due to its basic nature.


Question. How will you test the presence of primary amine ?
Answer. By carbyl amine test.
RNH2 + CHCl3 + 3KOH → R—NC + 3KCl + 3H2O

Question. What is vapour phase nitration ?
Answer.
Amines 14

(High temperature and nitration in vapour phase only)


Question. Write one use of dopamine and atropine alkaloid.
Answer. Dopamine : Neurotransmitter
Atropine alkaloid : 0.5-1.0% solution ophthalmic examination.


Question. Direct nitration of aniline is not carried out. Explain.
Answer. (H2SO4 + HNO3) easily oxidized aniline into tarry complex product due to high e− density on the benzene ring of aniline.


Question. Among the compounds as following which will react with
Amines 15
to give product containing > C = N − ?

(i) C6H5NH2            (ii) (CH3)3N
(iii) C6H5NHC6H5    (iv) C6H5NHNH2
Answer. C6H5NH2 and C6H5NHNH2.


Question. How will you give expression for Kb to indicate its basic strength ?
Answer.

Amines 16


Question. What happens when aniline is treated with bromine ?
Answer.

Amines 17


Question. Write a chemical equation to illustrate the ammonolysis.
Answer. For alcohols :
Amines 18


Question. Write the structure of p-toluidine.
Answer.
Amines 19


Question. Prepare/convert nitrobenzene into aniline.
Answer.
Amines 20


Question. Convert C6H5COOH to C6H5NH2.
Answer.
Amines 21


Question. Write isomerism exhibited by different amines.
Answer. Chain, position, metamerism, functional.


Question. Arrange the following compounds in increasing order of solubility in water:
C6H5NH2, (C2H5)2NH, C2H5NH2
Answer. C6H5NH2 < (C2H5)2NH< C2H5NH2

 

SHORT ANSWER TYPE QUESTIONS 

Question. Complete the following acid-base reactions and name the products :
(i) CH3CH2CH2NH2 + HCl →
(ii) (CH3CH2)3N + HCl →
Answer. (i) CH3CH2CH2N+H3Cl− (n-propyl ammonium chloride)
(ii) (CH3CH2)3 – N+HCl− (Triethyl ammonium chloride)


Question. Write chemical reaction of C6H5NH2 + C6H5COCl and name product obtained.
Answer.
Amines 22


Question. How will you convert :
(i) 3-methylaniline → 3-nitrotoluene
(ii) Aniline → 1, 3, 5-tribromobenzene
Answer.
Amines 23


Question. How will you convert :
(i) Propanoic acid → Ethanoic acid
(ii) Nitromethane → Dimethylamine
Answer.
Amines 24


Question. Draw the structures of the following compounds :
(i) N-isopropylaniline (ii) t-butylamine
Answer.
Amines 25


Question. Why C6H5N+(CH3)3OH− a stronger base than NH4OH ?
Answer. Due to – I effect of phenyl group, it decreases e− density on nitrogen atom but no such group in NH4OH.


Question. Explain Kb order : Et2NH > Et3N > EtNH2 in aqueous solution.
Answer. Basicity of amines in aqueous solution depends upon :
(i) + I effect of an alkyl group.
(ii) Extent of hydrogen bonding with H2O.
(iii) Steric effects of alkyl groups.


Question. Distinguish between 1º, 2º and 3º amines by HNO2 acid test.
Answer. 1º gives N2 gas. 2º gives yellow oily compound. 3º form water soluble salts.
CH3CH2NH2 + HNO2 → C2H5OH + N2 + H2O
R2NH + HNO2 → R2N – N = O + H2O
Amines 26


Question. A compound ‘A’ having molecular formula C3H7ON reacts with Br2 in presence of NaOH to give compound ‘B’. This compound ‘B’ reacts with HNO2 to form alcohol and N2 gas. Identify compound ‘A’ and ‘B’ and write the reaction involved.
Answer.
Amines 27

 


Question. Write chemical equation for the following conversions :
(i) CH3 − CH2 – Cl → CH2 – CH2 – CH2 – NH2
(ii) C6H5 – CH2 – Cl → C6H5CH2CH2 – NH2
Answer.
(i) With NaCN and reduction
Amines 28


Question. Account for :
(i) Amino group in aniline is o- and p- directing in aromatic electrophilic substitution reactions. Aniline on nitration gives a substantial amount of m-nitroaniline.
(ii) Aniline does not go Friedel Crafts reaction.
Answer. (i) It is because aniline is protonated to form anilinium cation, in which NHgroup is meta-directing..
(ii) It is because aniline is basic, can form adduct with AlCl3, electrophile cannot be generated.


Question. Account for the following :
(i) Electrophilic substitution in aromatic amines takes place more readily than benzene.
(ii) Nitro compounds have higher boiling points than hydrocarbons having almost same molecular mass.
Answer. (i) –NH2 is ERG, electrophilic substitution takes place faster.
(ii) Nitro compounds are more polar than hydrocarbons therefore have more van der Waal’s forces of attraction.


Question. Write short notes on :
(i) Coupling reaction
(ii) Ammonolysis
Answer.
Amines 29


Question. Prepare pure sample of 1º amine from 1º alkyl halide.
Answer. By Gabriel Phthalimide Reaction
Amines 30

 

SHORT ANSWER TYPE QUESTIONS 

Question. What happens when :
(i) An alkyl halide reacts with AgNO2 and product is reduced.
(ii) An alkyl halide is treated with AgCN and product is hydrolysed.
(iii) Methyl magnesium is treated with cyanogens chloride.
Answer.
Amines 31


Question. How would you prepare :
(i) C6H5NH2 from C6H5NO2
(ii) CH3NH2 from C2H5NH2
(iii) C2H5NH2 from CH3NH2
Answer.
Amines 32


Question. Write the structure of the products in each case :
Amines 33
Answer. (i) CH3CH2NHCOCH3, CH3COOH
Amines 34
(iii) CH3CH2COOH + NH4+


Question. Write the structures of A, B and C in following
Amines 35

Answer. (i) C6H5NH2 ,C6H5N2+Cl ,C6H5
(ii) CH3CN, CH3CH2NH2, CH3CH2NC


Question. Write the structure of reagents/organic compounds ‘A’ to ‘F’ :
Answer.
Amines 36

 

LONG ANSWER TYPE QUESTIONS 

Question. Arrange the following :
(i) In decreasing order of pKb values :
C2H5NH2, C6H5NHCH3, (C2H5)2NH and C6H5NH2
(ii) In increasing order of basic strength :
(a) Aniline, p-nitroaniline and p-toluidine
(b) C6H5NH2, C6H5NHCH3, C6H5CH2NH2
(iii) In decreasing order of basic strength :
C6H5NH2, C6H5N(CH3)2, (C2H5)2NH, CH3NH2
(iv) Decreasing order of basic strength in gas phase :
C2H5NH2, (C2H5)2NH, (C2H5)3N and NH3
(v) Increasing order of boiling point :
C2H5OH, (CH3)2NH,C2H5NH2
Answer. (i) C6H5NH2 > C6H5NHCH3 > C2H5NH2 > (C2H5)2NH
(ii) (a) p-nitroaniline < aniline < p-toluidine
(b) C6H5NH2 < C6H5NHCH3 < C6H5CH2NH2
(iii) (C2H5)2NH > CH3NH2 > C6H5N(CH3)2 > C6H5NH2
(iv) (C2H5)3N > (C2H5)2NH > C2H5NH2 > NH3
(v) (CH3)2NH < C2H5NH2 < C2H5OH


Question. How will you convert :
(i) Ethanoic acid into methanamine
(ii) Hexane nitrile into 1-aminopentane
(iii) Methanol into ethanoic acid
(iv) Ethanamine into methanamine
Answer.
Amines 37

Amines 38

Question. Write short note on the following :
(i) Carbylamine reaction
(ii) Diazotization
(iii) Hoffmann’s bromide reaction
(iv) Coupling reaction
(v) Ammonolysis
Answer. (i) Carbylamine reaction : When primary amine (aromatic or aliphatic) warmed with chloroform and alc. KOH, isocyanides are formed which can be identified by their offensive smell. This test is used to identify the presence of primary amine or chloroform.
Amines 39

(b) Diazotization : When primary aromatic amine is treated with NaNO2 and HCl at 273-278 K, diazonium salt is obtained. This reaction is known as diazotization.
Amines 40
Benzenediazonium chloride is a very important synthetic compound, which can be changed into heloarenes, phenol, cyanobenzene, benzene etc.

(c) Hoffmann’s bromide reaction : When any primary amide (aliphatic or aromatic) is treated with bromine and alkali, it gives the amine with one less carbon atom.
Amines 41

This reaction is used to reduce one carbon atom from a compound.
(d) Coupling reaction : When benzenediazonium chloride is treated with phenols or aromatic amines, azo dyes are produced in which diazo
(− N = N −) group is retained. Coupling reactions generally take place at p-position of phenol or aromatic amines.
Amines 42

(e) Ammonolysis : Reaction of alkyl halides with ammonia is known as ammonolysis. Ammonolysis generally gives the mixture of 1º, 2º, 3º amines and quaternary ammonium salt.
Amines 43


Question. Complete the following reactions :
(i) C6H5NH2 + H2SO4 (conc.) →
(ii) C6H5N2Cl + C2H5OH →
(iii) C6H5NH2 + (CH3CO)2O →
(iv) C6H5N2Cl + H3PO2 + H2O →
(v) C6H5NH2 + CHCl3 + 3KOH (alc.) →
Answer.
Amines 44

(ii) C6H6 + N2 + HCl + CH3CHO
(iii) C6H5NHCOCH3 + CH3COOH
(iv) C6H6 + H3PO3 + HCl + N2
(v) C6H5NC + 3KCl + 3H2O


Question. Write A, B and C in the given reactions :
Amines 45
Answer.
Amines 46


Question. Accomplish the following conversions :
(i) C6H5NO2 → C6H5 – COOH
(ii) Benzene → m-bromophenol
(iii) C6H5COOH → C6H5NH2
(iv) Aniline → 2, 4, 6 tribromoaniline
(v) Benzylchloride → 2-phenyl ethanamine
Answer.
Amines 47

Amines 48
 

Question. Given reasons : (i) Acetylation of aniline reduces its activation effect.
(ii) CH3NH2 is more basic than C6H5NH2
(iii) Although –NH2 group is o/p directing , yet aniline on nitration gives a significant amount of m-nitroaniline
Answer. (i) Due to the resonance, the electron pair of nitrogen atom gets delocalised towards carbonyl group/resonating structures.
(ii) Because of +I effect in methylamine electron density at nitrogen increases whereas in aniline resonance takes place and electron density on nitrogen decreases / resonating structures.
(iii) Due to protonation of aniline / formation of anilinium ion

 

More Questions

1.Arrange the following in order of decreasing basic strength

(a) Ethyl amine, Ammonia, Triethyl amine

(b) Aniline, p- Nitroaniline , p- Toluidine

2.Amine group in aniline is ortho and para directing. Why does then aniline on nitration give substantial amount of m-nitroaniline

3.Primary amines have higher boiling points than tertiary amines. Why?

4.‘Amide are more acidic than amines’. Why?

5.Arrange the following amines in the ascending order of basic strength giving reason-EtNH2, Et2NH,Et3N, in aqueous solution?

6.Explain the role of mineral acid in the reaction of a carbonyl compound with KCN (aq)?

7.Why is acetonitrile preferred as a solvent for running organic reaction?

8.Why aniline is acetylated first to prepare mono bromo derivative?

9.Ammonolysis of alkyl halide does not give a corresponding amine in pure state. Explain?

10.Explain why methyl bromide reacts with KCN go give mostly methyl cyanide but it reacts with AgCN to give mostly methyl isocyanide.

11.Why is necessary to maintain the temperature between 273 K and 278 K during diazotization?

12.Why does silver chloride dissolve in aqueous methyl amine solution?

13.How can the following conversion be carried out :-

(a) p-toluidine to 2- bromo-4- methylanline

(b) Aniline to iodobenzene

(c) Aniline to benzonitrile

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