Amines HOTs Class 12 Chemistry

Please refer to Amines HOTs Class 12 Chemistry provided below with solutions. All HOTs for Class 12 Chemistry with answers provided below have been designed as per the latest syllabus and examination petter issued by CBSE, NCERT, KVS. Students of Standard 12 Chemistry should learn the solved HOTS for Class 12 Chemistry provided below to gain better marks in examinations.

Amines Class 12 Chemistry HOTs

Question. In the reaction,

(a) NH₃
(b) N₂
(c) O₂
(d) CO₂

Question. Amines behave as
(a) lewis acids
(b) lewis bases
(c) aprotic acids
(d) amphoteric compounds

Question. What is the IUPAC name of the following compound ?

(a) 2-methyl-4-hexanamine
(b) 5-methyl-3-hexanamine
(c) 2-methyl-4-amino hexane
(d) 5-methyl-3-amino hexane

Question. Which of the following statement is correct ?
(a) Ammonia is more basic than methylamine.
(b) Methylamine is more basic than ammonia.
(c) Dimethylamine is less basic than methylamine.
(d) Dimethylamine is less basic than trimethylamine.

Question. Substitution of one alkyl group by replacing hydrogen of primary amines
(a) increases the base strength
(b) decreases the base strength
(c) remains the same
(d) None of the above

Question. For carbylamine reaction, we need hot alcoholic KOH and
(a) any primary amine and chloroform
(b) chloroform and silver powder
(c) a primary amine and an alkyl halide
(d) a monoalkylamine and trichloromethane.

Question. Propionamide on Hofmann degradation gives –
(a) methyl amine
(b) ethyl amine
(c) propyl amine
(d) ethyl cyanide

Question.The best reagent for converting 2 – phenylpropanamide into 2-phenylpropanamine is ___________.
(a) excess H₂
(b) Br₂in aqueous NaOH
(c) iodine in the presence of red phosphorus
(d) LiAlH₄in ether

Question. The correct order of basicity of the following compounds

(a) B > A > C
(b) A > B > C
(c) C > A > B
(d) C > B > A

Question. Which of the following compounds is most basic?

Question. Amines play an important role in the survival of life.
Naturally they are found in
(a) proteins
(b) vitamins
(c) alkaloids
(d) All of these

Question. The correct decreasing order of basic strength of the following species is __________ H₂O, NH₃, OH^–, NH₂^–

Question. Ethyl amine can be obtained by the
(a) Action of NH₃ on ethyl iodide.
(b) Action of NH₃ on ethyl alcohol.
(c) Both (a) and (b)
(d) Neither (a) nor (b)

Question. Which of the following factors affect the basic strength of amine?
(i) Inductive effect
(ii) Steric hinderance
(iii) Solvation effect
(iv) Solubility in organic solvents.
(a) (i) and (iv)
(b) (i), (ii) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)

Question. Which of the following amines can be prepared by Gabriel method ?
(i) CH₃CH₂NH₂
(ii) (CH₃)₂CHNH₂
(iii) (CH₃)₃CNH₂
(iv) C₆H₅NH₂
(a) (i) and (iii)
(b) (ii) and (iv)
(c) (i), (ii) and (iii)
(d) (i) and (ii)

Question. Aliphatic amines are…..basic than NH₃ but aromatic amines are……basic than NH₃.
(a) more, less
(b) less, more
(c) both (a) and (b)
(d) None of these

Question. Aniline is used
(a) in crimping of wool
(b) in dyeing industry
(c) in making of glue
(d) in fast drying vanish

Question. In the ammonolysis of alkyl halides the halogen atom is replaced by an amino(–NH₂) group which of the following represent the correct order of reactivity of halides with amines.
(a) RBr > RI > RCl
(b) RI > RCl > RBr
(c) RI > RBr > RCl
(d) RCl > RBr > RI

Question. Gabriel’s phthalimide synthesis is used for the preparation of
(a) Primary aromatic amines
(b) Secondary amines
(c) Primary aliphatic amines
(d) Tertiary amines

Question. Mark the correct statement
(a) Methylamine is slightly acidic
(b) Methylamine is less basic than ammonia
(c) Methylamine is a stronger base than ammonia
(d) Methylamine forms salts with alkalies.

Question. Which of the following compounds is the weakest Bronsted base?

Question. Which statement is not true among the following?
(a) Amines are bases
(b) They turn red litmus blue
(c) Trimethyl amine is less basic than dimethyl amine
(d) Amines yield alcohols on aqueous hydrolysis.

Question.

Question. Aniline is less soluble in water than ethyl amine due to
(a) resonance stablization of benzene ring
(b) resonance stabilization of anilium ion
(c) more hydrophobic nature of C₆H₅ group than C₂H₅ group
(d) more hydrophobic nature of C₆H₅ group than C₂H₅ group

CRITICAL THINKING TYPE QUESTIONS

Question. What is the decreasing order of basicity of primary,secondary and tertiary ethylamines and NH₃ ?
(a) NH₃ > C₂H₅NH₂ > (C₂H₅)₂NH > (C₂H₅)₃N
(b) (C₂H₅)₃N > (C₂H₅)₂NH > C₂H₅NH₂ > NH₃
(c) (C₂H₅)₂NH > C₂H₅NH₂ > (C₂H₅)₃N > NH₃
(d) (C₂H₅)₂ NH > C₂H₅NH₂ > (C₂H₅)₃ NH > NH₃

Question. Which of the following is the correct IUPAC name of the compound ?

(a) 1, 2-dichloro-4-(N, N-dimethyl) aniline
(b) Dimethyl – (3, 4-dichlorophenyl) amine
(c) 3, 4-dichloro – N, N-dimethyl aniline
(d) N, N-dimethylamino – 3, 4-dichlorobenzene

Question.

Question. A primary amine is formed by an amide on treatment with bromine and alkali. The primary amine has
(a) 1 carbon atom less than amide
(b) 1 carbon atom more than amide
(c) 1 hydrogen atom less than amide
(d) 1 hydrogen atom more than amide

Question. The most reactive amine towards dilute hydrochloric acid is _________ .

Question. Which one of the following is the strongest base in aqueous solution ?
(a) Methylamine
(b) Trimethylamine
(c) Aniline
(d) Dimethylamine

Question. The correct increasing order of basic strength for the following compounds is __________.

(a) II < III < I
(b) III < I < II
(c) III < II < I
(d) II < I < III

Question. The correct order of the increasing basicity of methyl amine, ammonia and aniline is
(a) methyl amine < aniline < ammonia
(b) aniline < ammonia < methyl amine
(c) aniline < methyl amine < ammonia
(d) ammonia < aniline < methyl amine

Question. The IUPAC name of diethyl isopropyl amine is
(a) N, N-diethylpropan-2-amine
(b) N, N-diethylpropan-1-amine
(c) N, N-diethylisopropylamine
(d) N, N-diethylaminopropane

Question. Arrange the following amines in the decreasing order of their basicity

(a) 1 > 3 > 2
(b) 3 > 2 > 1
(c) 1 > 2 > 3
(d) 2 > 1 > 3

Question. Amine that cannot be prepared by Gabriel phthalimide synthesis is
(a) aniline
(b) benzylamine
(c) methylamine
(d) iso-butylamine

Question. A compound of molecular formulae C₃H₆N shows following characteristics
(i) Get dissolved in acidic medium.
(ii) Does not react with benzoylchloride
(iii) Does not give carbylamine test
(iv) Does not evolute nitrogen gas on reacting with HNO₂ than structure of the compound is
(a) trimethylamine
(b) isopropylamine
(c) propylamine
(d) None of these

Question. Which of the statement is true regarding the basicity of the following two primary amines ?

(a) Both are equally basic because both are 1º amines
(b) I > II because it is an aromatic amine
(c) II > I because it is an aliphatic amine
(d) I < II because of difference in the nature of β-carbon

Question. In a reaction of aniline a coloured product C was obtained.

The structure of C would be :

Question. Aniline when treated with conc. HNO₃ gives
(a) p-Phenylenediamine
(b) m-Nitroaniline
(c) p-Benzoquinone
(d) Nitrobenzene

Question. Acetamide is treated with the following reagents separately.
Which one of these would yield methylamine?
(a) NaOH – Br₂
(b) Sodalime
(c) Hot conc. H₂SO₄
(d) PCl₅

Question. Which of the following compounds is most basic?

Question. IUPAC name of the following compound is

(a) 2-chloro pentanamine
(b) 4-chloro pentan-1-amine
(c) 4-chloro pent-2-en-1-amine
(d) 2-chloro pent-3-en-5-amine

Question. High basicity of Me₂NH relative to Me₃N is attributed to:
(a) effect of solvent
(b) inductive effect of Me
(c) shape of Me₂NH
(d) shape of Me₃N

Question. Towards electrophilic substitution, the most reactive will be
(a) Nitrobenzene
(b) Aniline
(c) Aniline hydrochloride
(d) N-Acetylaniline

Question. The correct order of decreasing basic character is

(a) II > I > III > IV
(b) IV > II > I > III
(c) IV > III > II > I
(d) IV > II > III > I

Question. Nitration of nitrobenzence is carried out than obtained product is reduced with Fe/HCl, product so formed on reaction with HNO₂ and than with H₂O, forms
(a) 1,3–dihydroxybenzene
(b) 3–nitrophenol
(c) 2– nitrophenol
(d) 1,2–dihydroxybenzene

Question.

Question.

The basicity order of I, II and III is –
(a) III > I > II
(b) I > II > III
(c) III > II > I
(d) II > III > I