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    3.

    Aqueous solution of CH3COOH{\rm{C}}{{\rm{H}}_3}{\rm{COOH}} contains:

    A

    CH3COOH,H+{\rm{C}}{{\rm{H}}_3}{\rm{COOH}},{{\rm{H}}^ + }

    B

    CH3COO,H3O+,CH3COOH{\rm{C}}{{\rm{H}}_3}{\rm{CO}}{{\rm{O}}^ - },{{\rm{H}}_3}{{\rm{O}}^ + },{\rm{C}}{{\rm{H}}_3}{\rm{COOH}}

    C

    CH3COO,H3O+,H+{\rm{C}}{{\rm{H}}_3}{\rm{CO}}{{\rm{O}}^ - },{{\rm{H}}_3}{{\rm{O}}^ + },{{\rm{H}}^ + }

    D

    CH3COOH,CH3COO,H+{\rm{C}}{{\rm{H}}_3}{\rm{COOH}},{\rm{C}}{{\rm{H}}_3}{\rm{CO}}{{\rm{O}}^ - },{{\rm{H}}^ + }

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    10.

    The decreasing order of strength of the bases,

    OH,NH2,HCC  and  CH3CH2,  is{\rm{O}}{{\rm{H}}^ - },{\rm{NH}}_2^ - ,{\rm{H}}-{\rm{C}} \equiv {{\rm{C}}^ - }\;and\;{\rm{C}}{{\rm{H}}_3}-{\rm{CH}}_2^ - ,\;is

    A

    CH3CH2>NH2>HCC>OH{\rm{C}}{{\rm{H}}_3}-{\rm{CH}}_2^ - > N{\rm{H}}_2^ - > H-C \equiv {{\rm{C}}^ - } > O{{\rm{H}}^ - }

    B

    HCC>CH3CH2>NH2>OH{\rm{H}}-{\rm{C}} \equiv {{\rm{C}}^ - } > C{{\rm{H}}_3}-{\rm{CH}}_2^ - > N{\rm{H}}_2^ - > O{{\rm{H}}^ - }

    C

    OH>NH2>HCC>CH3CH2{\rm{O}}{{\rm{H}}^ - } > N{\rm{H}}_2^ - > H-C \equiv {{\rm{C}}^ - } > C{{\rm{H}}_3}-{\rm{CH}}_2^ -

    D

    NH2>HCC>OH>CH3CH2{\rm{NH}}_2^ - > H-C \equiv {{\rm{C}}^ - } > O{{\rm{H}}^ - } > C{{\rm{H}}_3}-{\rm{CH}}_2^ -

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