Q1Multiple choice
Which of the following is a 3° amine?
- (i)1-methylcyclohexylamine
- (ii)Triethylamine
- (iii)tert-butylamine
- (iv)N-methylaniline
Show answer
(ii) Triethylamine
Chapter 13
Class 12 Chemistry · 67 questions · 61 with answers
Questions
Q2Multiple choice
The correct IUPAC name for CH2==CHCH2 NHCH3 is
- (i)Allylmethylamine
- (ii)2-amino-4-pentene
- (iii)4-aminopent-1-ene
- (iv)N-methylprop-2-en-1-amine
Show answer
(iv) N-methylprop-2-en-1-amine
Q3Multiple choice
Amongst the following, the strongest base in aqueous medium is ____________.
- (i)CH3NH2
- (ii)NCCH2NH2
- (iii)(CH3)2 NH
- (iv)C6H5NHCH3
Show answer
(iii) (CH3)2 NH
Q4Multiple choice
Which of the following is the weakest Brönsted base?
- (i)
- (ii)
- (iii)
- (iv)CH3NH2
Show answer
(i)
Q5Multiple choice
Benzylamine may be alkylated as shown in the following equation : C6H5CH2NH2 + R—X → C6H5CH2NHR Which of the following alkylhalides is best suited for this reaction through SN1 mechanism?
- (i)CH3Br
- (ii)C6H5Br
- (iii)C6H5CH2Br
- (iv)C2H5 Br
Show answer
(iii) C6H5CH2Br
Q6Multiple choice
Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?
- (i)H2 (excess)/Pt
- (ii)LiAlH4 in ether
- (iii)Fe and HCl
- (iv)Sn and HCl
Show answer
(ii) LiAlH4 in ether
Q7Multiple choice
In order to prepare a 1° amine from an alkyl halide with simultaneous addition of one CH2 group in the carbon chain, the reagent used as source of nitrogen is ___________.
- (i)Sodium amide, NaNH2
- (ii)Sodium azide, NaN3
- (iii)Potassium cyanide, KCN – +
- (iv)Potassium phthalimide, C6H4(CO)2N K
Show answer
(iii) Potassium cyanide, KCN – +
Q8Multiple choice
The source of nitrogen in Gabriel synthesis of amines is _____________.
- (i)Sodium azide, NaN3
- (ii)Sodium nitrite, NaNO2
- (iii)Potassium cyanide, KCN – +
- (iv)Potassium phthalimide, C6H4(CO)2N K
Show answer
(iv) Potassium phthalimide, C6H4(CO)2N K
Q9Multiple choice
Amongst the given set of reactants, the most appropriate for preparing 2° amine is _____.
- (i)2° R—Br + NH3
- (ii)2° R—Br + NaCN followed by H2/Pt 181 Amines
- (iii)1° R—NH2 + RCHO followed by H2/Pt
- (iv)1° R—Br (2 mol) + potassium phthalimide followed by H3O+/heat
Show answer
(iii) 1° R—NH2 + RCHO followed by H2/Pt
Q10Multiple choice
The best reagent for converting 2–phenylpropanamide into 2-phenylpropanamine is _____.
- (i)excess H2
- (ii)Br2 in aqueous NaOH
- (iii)iodine in the presence of red phosphorus
- (iv)LiAlH4 in ether
Show answer
(iv) LiAlH4 in ether
Q11Multiple choice
The best reagent for converting, 2-phenylpropanamide into 1- phenylethanamine is ____.
- (i)excess H2/Pt
- (ii)NaOH/Br2
- (iii)NaBH4/methanol
- (iv)LiAlH4/ether
Show answer
(ii) NaOH/Br2
Q12Multiple choice
Hoffmann Bromamide Degradation reaction is shown by __________.
- (i)ArNH2
- (ii)ArCONH2
- (iii)ArNO2
- (iv)ArCH2NH2
Show answer
(ii) ArCONH2
Q13Multiple choice
The correct increasing order of basic strength for the following compounds is _________. (I) (II) (III)
- (i)II < III < I
- (ii)III < I < II
- (iii)III < II < I
- (iv)II < I < III
Show answer
(iv) II < I < III
Q14Multiple choice
Methylamine reacts with HNO2 to form _________.
- (i)CH3—O—N ==O
- (ii)CH3—O—CH3
- (iii)CH3OH
- (iv)CH3CHO
Show answer
(iii) CH3OH
Q15Multiple choice
The gas evolved when methylamine reacts with nitrous acid is __________.
- (i)NH3
- (ii)N2
- (iii)H2
- (iv)C2H6
Show answer
(ii) N2
Q16Multiple choice
In the nitration of benzene using a mixture of conc. H2SO4 and conc. HNO3, the species which initiates the reaction is __________.
- (i)NO2 +
- (ii)NO +
- (iii)NO2 –
- (iv)NO2
Show answer
(iii) NO2 –
Q17Multiple choice
Reduction of aromatic nitro compounds using Fe and HCl gives __________.
- (i)aromatic oxime
- (ii)aromatic hydrocarbon
- (iii)aromatic primary amine
- (iv)aromatic amide
Show answer
(iii) aromatic primary amine
Q18Multiple choice
The most reactive amine towards dilute hydrochloric acid is ___________.
- (i)CH3—NH2
- (ii)
- (iii)
- (iv)
Show answer
(ii)
Q19Multiple choice
Acid anhydrides on reaction with primary amines give ____________.
- (i)amide
- (ii)imide
- (iii)secondary amine
- (iv)imine 183 Amines + – Cu/HCl
Show answer
(i) amide
Q20Multiple choice
The reaction Ar N2Cl → ArCl + N2 + CuCl is named as _________.
- (i)Sandmeyer reaction
- (ii)Gatterman reaction
- (iii)Claisen reaction
- (iv)Carbylamine reaction
Show answer
(ii) Gatterman reaction
Q21Multiple choice
Best method for preparing primary amines from alkyl halides without changing the number of carbon atoms in the chain is
- (i)Hoffmann Bromamide reaction
- (ii)Gabriel phthalimide synthesis
- (iii)Sandmeyer reaction
- (iv)Reaction with NH3
Show answer
(ii) Gabriel phthalimide synthesis
Q22Multiple choice
Which of the following compound will not undergo azo coupling reaction with benzene diazonium chloride.
- (i)Aniline
- (ii)Phenol
- (iii)Anisole
- (iv)Nitrobenzene
Show answer
(iv) Nitrobenzene
Q23Multiple choice
Which of the following compounds is the weakest Brönsted base?
- (i)
- (ii)
- (iii)
- (iv)
Show answer
(iii)
Q24Multiple choice
Among the following amines, the strongest Brönsted base is __________.
- (i)
- (ii)NH3
- (iii)
- (iv)
Show answer
(iv)
Q25Multiple choice
The correct decreasing order of basic strength of the following species is _______. – – H2O, NH3, OH , NH2 – –
- (i)NH2 > OH > NH3 > H2O – –
- (ii)OH > NH2 > H2O > NH3 – –
- (iii)NH3 > H2O > NH2 > OH – –
- (iv)H2O > NH3 > OH > NH2
Show answer
(i) NH2 > OH > NH3 > H2O – –
Q26Multiple choice
Which of the following should be most volatile? (I) CH3CH2CH2NH2 (II) (CH3)3N (III) (IV) CH3CH2CH3
- (i)II
- (ii)IV
- (iii)I
- (iv)III
Show answer
(ii) IV
Q27Multiple choice
Which of the following methods of preparation of amines will give same number of carbon atoms in the chain of amines as in the reactant?
- (i)Reaction of nitrite with LiAlH4.
- (ii)Reaction of amide with LiAlH4 followed by treatment with water.
- (iii)Heating alkylhalide with potassium salt of phthalimide followed by hydrolysis.
- (iv)Treatment of amide with bromine in aqueous solution of sodium hydroxide. 185 Amines
Show answer
(iii) Heating alkylhalide with potassium salt of phthalimide followed by hydrolysis.
Q28Multiple correct
Which of the following cannot be prepared by Sandmeyer’s reaction?
- (i)Chlorobenzene
- (ii)Bromobenzene
- (iii)Iodobenzene
- (iv)Fluorobenzene
Show answer
(iii) Iodobenzene
(iv) Fluorobenzene
Q29Multiple correct
Reduction of nitrobenzene by which of the following reagent gives aniline?
- (i)Sn/HCl
- (ii)Fe/HCl
- (iii)H2-Pd
- (iv)Sn/NH4OH
Show answer
(i) Sn/HCl
(ii) Fe/HCl
(iii) H2-Pd
Q30Multiple correct
Which of the following species are involved in the carbylamine test?
- (i)R—NC
- (ii)CHCl3
- (iii)COCl2
- (iv)NaNO2 + HCl
Show answer
(i) R—NC
(ii) CHCl3
Q31Multiple correct
The reagents that can be used to convert benzenediazonium chloride to benzene are __________.
- (i)SnCl2/HCl
- (ii)CH3CH2OH
- (iii)H3PO2
- (iv)LiAlH4
Show answer
(ii) CH3CH2OH
(iii) H3PO2
Q32Multiple correct
The product of the following reaction is __________.
- (i)
- (ii)
- (iii)
- (iv)
Show answer
(i)
(ii)
Q33Multiple correct
Arenium ion involved in the bromination of aniline is __________.
- (i)
- (ii)
- (iii)
- (iv)187 Amines
Show answer
(i)
(ii)
(iii)
Q34Multiple correct
Which of the following amines can be prepared by Gabriel synthesis.
- (i)Isobutyl amine
- (ii)2-Phenylethylamine
- (iii)N-methylbenzylamine
- (iv)Aniline
Show answer
(i) Isobutyl amine
(ii) 2-Phenylethylamine
Q35Multiple correct
Which of the following reactions are correct?
- (i)
- (ii)
- (iii)
- (iv)
Show answer
(i)
(iii)
Q36Multiple correct
Under which of the following reaction conditions, aniline gives p-nitro derivative as the major product?
- (i)Acetyl chloride/pyridine followed by reaction with conc. H2SO4 + conc. HNO3.
- (ii)Acetic anyhdride/pyridine followed by conc. H2SO4 + conc. HNO3.
- (iii)Dil. HCl followed by reaction with conc. H2SO4 + conc. HNO3.
- (iv)Reaction with conc. HNO3 + conc.H2SO4.
Show answer
(i) Acetyl chloride/pyridine followed by reaction with conc. H2SO4 + conc. HNO3.
(ii) Acetic anyhdride/pyridine followed by conc. H2SO4 + conc. HNO3.
Q37Multiple correct
Which of the following reactions belong to electrophilic aromatic substitution?
- (i)Bromination of acetanilide
- (ii)Coupling reaction of aryldiazonium salts
- (iii)Diazotisation of aniline
- (iv)Acylation of aniline
Show answer
(i) Bromination of acetanilide
(ii) Coupling reaction of aryldiazonium salts
Q38Short answer
What is the role of HNO3 in the nitrating mixture used for nitration of benzene?
Show answer
HNO3 acts as a base in the nitrating mixture and provides the electrophile, + NO2 .
Q39Short answer
Why is NH2 group of aniline acetylated before carrying out nitration?
Show answer
See NCERT textbook for Class XII.
Q40Short answer
What is the product when C6H5CH2NH2 reacts with HNO2?
Show answer
C6H5CH2OH
Q41Short answer
What is the best reagent to convert nitrile to primary amine?
Show answer
Reduction of nitriles with sodium/alcohol or LiAlH4 gives primary amine.
Q42Short answer
Give the structure of ‘A’ in the following reaction.
Q43Short answer
What is Hinsberg reagent?
Show answer
Benzene sulphonylchloride.
Q44Short answer
Why is benzene diazonium chloride not stored and is used immediately after its preparation?
Show answer
Benzene diazonium chloride is very unstable.
Q45Short answer
Why does acetylation of —NH2 group of aniline reduce its activating effect?
Show answer
See NCERT textbook for Class XII.
Q46Short answer
Explain why MeNH2 is stronger base than MeOH?
Show answer
Nitrogen is less electronegative than oxygen therefore lone pair of electrons on nitrogen is readily available for donation. Hence, MeNH2 is more basic than MeOH.
Q47Short answer
What is the role of pyridine in the acylation reaction of amines?
Show answer
Pyridine and other bases are used to remove the side product i.e. HCl from the reaction mixture.
Q48Short answer
Under what reaction conditions (acidic/basic), the coupling reaction of aryldiazonium chloride with aniline is carried out?
Show answer
Reaction is done in mild basic conditions.
Q49Short answer
Predict the product of reaction of aniline with bromine in non-polar solvent such as CS2.
Show answer
A mixture of 2-bromoaniline and 4-bromoaniline is formed. (2-Bromoaniline) (4-Bromoaniline)
Q50Short answer
Arrange the following compounds in increasing order of dipole moment. CH3CH2CH3, CH3CH2NH2, CH3CH2OH
Show answer
CH3CH2CH3 < CH3CH2NH2 < CH3CH2OH
Q51Short answer
What is the structure and IUPAC name of the compound, allyl amine?
Show answer
CH2== CH—CH2—NH2, prop-2-en-1-amine
Q52Short answer
Write down the IUPAC name of
Show answer
N, N-Dimethylbenzenamine
Q53Short answer
A compound Z with molecular formula C3H9N reacts with C6H5SO2Cl to give a solid, insoluble in alkali. Identify Z.
Show answer
Z is an aliphatic amine which gives a solid insoluble in base. This implies that reaction with C6H5SO2Cl must give a product without any replaceable hydrogen attached to nitrogen. In other words, the amine must be a secondary amine. i.e. Z is ethylmethylamine.
Q54Short answer
A primary amine, RNH2 can be reacted with CH3—X to get secondary amine, R—NHCH3 but the only disadvantage is that 3° amine and quaternary ammonium salts are also obtained as side products. Can you suggest a method where RNH2 forms only 2° amine?
Show answer
Carbylamine reaction is shown by 1° amine only which results in the replacement of two hydrogen atoms attached to nitrogen atom of NH2 group by one carbon atom. On catalytic reduction the isocyanide will give a secondary amine with one methyl group.
Q55Short answer
Complete the following reaction. 189 Amines
Show answer
The reaction exhibits azo-coupling of phenols. In mild alkaline conditions phenol moiety participates in the azo-coupling and para position of phenol is occupied. 195 Amines
Q56Short answer
Why is aniline soluble in aqueous HCl?
Show answer
Aniline forms the salt anilinium chloride which is water soluble.
Q57Short answer
Suggest a route by which the following conversion can be accomplished.
Q58Short answer
Identify A and B in the following reaction.
Q59Multiple choice
How will you carry out the following conversions?
- (i)toluene → p-toluidine
- (ii)p-toluidine diazonium chloride → p-toluic acid
Show answer
(i) toluene → p-toluidine
(ii) p-toluidine diazonium chloride → p-toluic acid
Q60Multiple choice
Write following conversions:
- (i)nitrobenzene → acetanilide
- (ii)acetanilide → p-nitroaniline
Show answer
(i) nitrobenzene → acetanilide
(ii) acetanilide → p-nitroaniline
Q61Short answer
A solution contains 1 g mol. each of p-toluene diazonium chloride and p- nitrophenyl diazonium chloride. To this 1 g mol. of alkaline solution of phenol is added. Predict the major product. Explain your answer.
Show answer
This reaction is an example of electrophilic aromatic substitution. In alkaline medium, phenol generates phenoxide ion which is more electron rich than phenol and hence more reactive for electrophilic attack. The electrophile in this reaction is aryldiazonium cation. Stronger the electrophile faster is the reaction. p-Nitrophenyldiazonium cation is a stronger electrophile than p-toluene diazonium cation. Therefore, it couples preferentially with phenol. 197 Amines
Q62Short answer
How will you bring out the following conversion?
Q63Short answer
How will you carry out the following conversion? NO2 → NH2
Q64Short answer
How will you carry out the following conversion? NH2 NO2 →
Q65Multiple choice
How will you carry out the following conversions?
- (i)
- (ii)
Show answer
(i)
(ii)
Q66Multiple choice
Match the reactions given in Column I with the statements given in Column II. Column I Column II (i) Ammonolysis
- (a)Amine with lesser number of carbon atoms (ii) Gabriel phthalimide synthesis
- (b)Detection test for primary amines. (iii) Hoffmann Bromamide reaction
- (c)Reaction of phthalimide with KOH and R—X (iv) Carbylamine reaction
- (d)Reaction of alkylhalides with NH3
Show answer
(a) Amine with lesser number of carbon atoms (ii) Gabriel phthalimide synthesis
(d) Reaction of alkylhalides with NH3
(b) Detection test for primary amines. (iii) Hoffmann Bromamide reaction
(c) Reaction of phthalimide with KOH and R—X (iv) Carbylamine reaction
Q67Multiple choice
Match the compounds given in Column I with the items given in Column II. Column I Column II (i) Benzene sulphonyl chloride
- (a)Zwitter ion (ii) Sulphanilic acid
- (b)Hinsberg reagent (iii) Alkyl diazonium salts
- (c)Dyes (iv) Aryl diazonium salts
- (d)Conversion to alcohols 191 Amines
Show answer
(a) Zwitter ion (ii) Sulphanilic acid
(b) Hinsberg reagent (iii) Alkyl diazonium salts
(c) Dyes (iv) Aryl diazonium salts
(d) Conversion to alcohols 191 Amines