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How many constitutional isomers are possible for the formula C4H9Cl?

    There are four possible constitutional isomers of ##”C”_4″H”_9″Cl”##.

    First draw all the constitutional isomers of ##”C”_4″H”_10##. You get

    (from hardinars.tk)

    and

    Then put a ##”Cl”## atom in every possible location on each of the carbon skeletons.

    From the straight-chain alkane, we get

    1-Chlorobutane

    and

    2-Chlorobutane

    From the branched-chain alkane, we get

    1-Chloro-2-methylpropane

    and

    2-Chloro-2-methylpropane

    And there are your four constitutional isomers of ##”C”_4″H”_9″Cl”##.

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