13 AMINES Textbook Solution class 12 Maharashtra board

    1. Choose the most correct option.

    i. The hybridisation of nitrogen in primary amine is …………
    a. sp b. sp2 c. sp3 d. sp3d

    Solution

    ii. Isobutylamine is an example of …………
    a. 2° amine b. 3° amine
    c. 1° amine
    d. quaternary ammonium salt.

    Solution

    iii. Which one of the following compounds has the highest boiling point ?
    a. n-Butylamine b. sec-Butylamine
    c. isobutylamine d. tert-Butylamine

    Solution

    iv. Which of the following has the highest basic strength ?
    a. Trimethylamine b. Methylamine
    c. Ammonia d. Dimethylamine

    Solution

    v. Which type of amine does produce N2 when treated with HNO2 ?
    a. Primary amine b. Secondary amine
    c. Tertiary amine
    d. Both primary and secondary amines

    Solution

    vi. Carbylamine test is given by
    a. Primary amine
    b. Secondary amine
    c. Tertiary amine
    d. Both secondary and tertiary amines

    Solution

    vii. Which one of the following compounds does not react with acetyl chloride ?
    a. CH3-CH2-NH2 b. (CH3-CH2)2NH
    c. (CH3-CH2)3N d. C6H5-NH2

    Solution

    viii. Which of the following compounds ill dissolve in aqueous NaOH after undergoing reaction with Hinsberg reagent ?
    a. Ethylamine b. Triethylamine
    c. Trimethylamine d. Diethylamine

    Solution

    ix. Identify ‘B’ in the following reactions
    CH3-C N Na/C2H5OH A NaNO2/dilHCl B
    a. CH3-CH2-NH2 b. CH3-CH2-NO2
    c. CH3-CH2N2
    ⊕Cl d. CH3-CH2-OH

    Solution

    x. Which one of the following compounds contains azo linkage ?
    a. Hydrazine
    b. p-Hydroxyazobenzene
    c. N-Nitrosodiethylamine
    d. Ethylenediamine

    Solution

    2. Answer in one sentence.

    i. Write reaction of p-toluenesulfonyl chloride with diethylamine.

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    ii. How many moles of methylbromide are required to convert ethanamine to N, N-dimethyl ethanamine ?

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    iii. Which amide does produce ethanamine by Hofmann bromamide degradation reaction?

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    iv. Write the order of basicity of aliphatic alkylamine in gaseous phase.

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    v. Why are primary aliphatic amines stronger bases than ammonia ?

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    vi. Predict the product of the following reaction.
    Nitrobenzene Sn/Conc. HCl ?

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    vii. Write the IUPAC name of benzylamine.

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    viii. Arrange the following amines in an increasing order of boiling points. n-propylamine, ethylmethyl amine,
    trimethylamine.

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    ix. Write the balanced chemical equations for the action of dil H2SO4 on diethylamine.

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    x. Arrange the following amines in the increasing order of their pKb values. Aniline, Cyclohexylamine, 4-Nitroaniline

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    3. Answer the following

    i. Identify A and B in the following reactions. C6H5CH2Br alco. KCN A Na/ethanol B.

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    ii. Explain the basic nature of amines with suitable example.

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    iii. What is diazotisation ? Write diazotisation reaction of aniline.

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    iv. Write reaction to convert acetic acid into methylamine.

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    v. Write a short note on coupling reactions.

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    vi. Explain Gabriel phthalimide synthesis.

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    vii. Explain carbylamine reaction with suitable examples.

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    viii. Write reaction to convert (i) methanamine into ethanamine (ii) Aniline into p-bromoaniline.

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    ix. Complete the following reactions :
    a. C6H5N2 ⊕Cl + C2H5OH
    b. C6H5NH2 + Br2(aq) ?

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    x. Explain Ammonolysis of alkyl halides.

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    xi. Write reaction to convert ethylamine into methylamine.

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    4. Answer the following.

    i. Write the IUPAC names of the following
    amines :
    CH3-CH2-N-CH2-CH2-CH3
    CH3
    CH3-C-CH2-CH2-NH2
    CH3
    CH3
    CH3-CH-NH-CH2-CH3
    CH3

    Solution

    ii. What are amines ? How are they classified ?

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    iii. Write IUPAC names of the following
    amines.
    a. H2N-(CH2)6-NH2
    b.
    NH2
    CH3
    CH3
    c.
    NH2
    NH2

    Solution

    iv. Write reactions to prepare ethanamine from
    a. Acetonitrile b. Nitroethane
    c. Propionamide

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    v. What is the action of acetic anhydride on ethylamine, diethylamine and  triethylamine ?

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    vii. Distinguish between ethylamine, diethylamine and triethylamine by using Hinsberg’s reagent ?

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    viii. Write reactions to bring about the following conversions :
    a. Aniline into p-nitroaniline
    b. Aniline into sulphanilic acid ?

    Solution