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Amines Test - 49

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Amines Test - 49
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  • Question 1
    1 / -0
    Decreasing order of basicity is 
    (1) CH3CONH2 CH_3CONH_2
    (2)CH3CH2NH2 CH_{3}CH_{2}NH_2
    (3) PhCH2CONH2 Ph-CH_{2}CONH_{2}
    Solution
    The more basic is 2 because of the N lon pair is not conduct in resonance so 
    Hence the B is correct option
  • Question 2
    1 / -0
    In the diazotisation of aniline with sodium nitrite and hdrochloric acid, an excess of hydrochloric acid is used primarily to
    Solution
    Excess of HCl is used to convert free aniline to aniline hydrochloride. Other wise free aniline would undergo coupling reaction with benzene diazonium chloride

    Hence A is correct option 
  • Question 3
    1 / -0
    Complete the following reaction
    RNH2+H2SO4  R NH_{2}+H_{2}SO_{4}\rightarrow 
    Solution
    Bases react with acid to form salt.
     Amines are basic in nature
     It forms salt on reaction with H2SO4H_2SO_4

  • Question 4
    1 / -0
    Which one of the following compound is most basic

    Solution
    In B structure the attached ethyl group is less electron withdrawing so this is most basic
    B is correct option
  • Question 5
    1 / -0
    The correct order of basicity of amines in water is 
    Solution
    (CH3)2NH>(CH3)3N>CH3NH2(CH_3)_2NH >(CH_3)_3N>CH_3NH_2

    As basicity of amines in water is determined by the tendency of donating electrons and 3degree amines will have the highest +I effect Leading to greater electron density followed by 2degree and primary amines


  • Question 6
    1 / -0
    The correct order of increasing basic nature for the bases NH3 NH_{3} ,CH3NH2 CH_{3}NH_{2} and (CH3)2NH (CH_{3})_{2}NH is 
    Solution
    Hence C is correct

  • Question 7
    1 / -0
    Aniline and methyl amine can be differentiated by 
    Solution
    Phenol react with aniline to give diazonium salt by coupling but Methyl amine not react with phenolss

    So B is correct
  • Question 8
    1 / -0
    Among the following, the strongest base is
    Solution
    Aliphatic amines are more basic than aromatic amines as the later are more stabilised due to resonance

    Hence B is correct answer
  • Question 9
    1 / -0
    Azo dye is prepared by the coupling of pehnol and :
    Solution
    Azo dye is prepared by the coupling of phenol and diazonium chloride.
    Hence A is correct option
  • Question 10
    1 / -0
    The correct most basicity in amines is 
    Solution
    The observed order in the case of lower members is found to be as secondary > primary > tertiary. This anomalous behavior of tertiary amines is due to steric factors i.e. crowding of alkyl groups cover nitrogen atom from all sides and thus makes it unable for protonation. Thus the relative strength is in order CH3NH2<(CH3)2NH>(CH3)3N
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