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Amines Test - 22

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Amines Test - 22
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  • Question 1
    1 / -0
    Aniline is soluble in which of the following organic reagents?
    Solution
    Aniline is soluble in, all organic solvents like alchol ether and benzene this is because of low polarity in amines and not a stronger intermolecular H- bonding in itself.
  • Question 2
    1 / -0
    In aqueous solution ______ amines are unexpectedly less basic than the others.
    Solution
    In aqueous solution tertiary amines are unexpectedly less basic than the others. This is due to steric factor and solvation of ions.
  • Question 3
    1 / -0
    In the preparation of primary amine by reduction of nitriles sodium amalgam can be used as reducing agent in presence of:
    Solution
    RCN EthylalcoholNaHg\xrightarrow [ Ethyl\quad alcohol ]{ Na-Hg } RCH2NH2RCH_2NH_2
    Reduction of cyanide in NaHgNa-Hg to amine (101^0) occur in presence of ethyl alcohol.
  • Question 4
    1 / -0
    Which of the following represents the decreasing order of basic strength of amines in the gas phase?
    Solution
    The following represents the decreasing order of basic strength of amines in the gas phase.

    tertiary amine >> secondary amine >> primary  amine 

    This is due +I (electron releasing) effect of alkyl groups.  With an increase in the number of alkyl groups, the electron density on N increases and the lone pair of electrons can be easily donated.

    Hence, the correct option is AA
  • Question 5
    1 / -0
    Which of the following is the correct order of the boiling points?
    Solution
    The following is the correct order of the boiling points.
    propane << ethylamine << ethyl alcohol
    In general, amines have higher boiling points than alkanes but lower boiling points than alcohols.
  • Question 6
    1 / -0
    The most basic compound in aqueous solution is:
    Solution

    The combined effect of the pushing effect of the alkyl group (+I effect), steric hindrance and the solvation of amines causes the basicity order to be: 

    $$NH_3<  tertiary\  amine  < primary \  amine< secondary\ amine$$.


    HN(CH3)2HN(CH_3)_2 is secondary amine. So it is most basic.

  • Question 7
    1 / -0
    Based on the combined effects of inductive effect and solvation, which of the following represents correct order of decreasing basic strength of amines?

    Solution
    Based on the combined effects of inductive effect and solvation, the following represents correct order of decreasing basic strength of amines
     secondary amine >>  tertiary amine  >> primary amine
    This is the order we observe in the aqueous solution. Secondary  amines are strongest bases.

  • Question 8
    1 / -0
    Which of the following represents the correct order of basic strength?.
    Solution
    The following represents the correct order of basic strength
    aniline >> diphenylaniline >> triphenylaniline 
    When hydrogen atoms of the amino group of arylamines are replaced by electron withdrawing phenyl groups, the basic character of the resulting amine decreases.
  • Question 9
    1 / -0
    In coupling reactions, diazonium ion acts as:
    Solution
    In coupling reaction, diazonium ion acts as electrophile because in diazonium salt +ve charge is there on nitrogen and thus nitrogen is electron deficient.
  • Question 10
    1 / -0
    Diazonium salts are used at a very lower temperature because:
    Solution
    Diazonium salt is used at very low temperature because of the fact that at the higher temperature they are unstable, as at higher temperature N2N_2 can leave out.
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