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KVPY Sample Paper KVPY Stream-SX Model Paper-26

  • question_answer
    The increasing order of the boiling points for the following compounds is: \[\begin{align}   & {{\operatorname{C}}_{2}}{{H}_{5}}OH{{C}_{2}}{{H}_{5}}Cl{{C}_{2}}{{H}_{5}}C{{H}_{3}}{{C}_{2}}{{H}_{5}}OC{{H}_{3}} \\  & \,\,\,\,(I)\,\,\,\,(II)\,\,\,(III)\,\,\,\,(IV) \\ \end{align}\]

    A) (III) < (IV) < (II) < (I)

    B) (IV) < (III) < (I) < (II)

    C) (II) < (III) < (IV) < (I)

    D) (III) < (II) < (I) < (IV)

    Correct Answer: A

    Solution :

    (I) \[{{C}_{2}}{{H}_{5}}OH\] hydrogen bonding Hydrogen bonding > Dipole-Dipole 
    (II) \[{{C}_{2}}{{H}_{5}}Cl\] Dipole-Dipole  \[{{C}_{2}}{{H}_{5}}Cl\]is more polar than \[{{C}_{2}}{{H}_{5}}OC{{H}_{3}}\]so, Dipole-Dipole \[{{C}_{2}}{{H}_{5}}Cl>\]Dipole- Dipole \[{{C}_{2}}{{H}_{5}}OC{{H}_{3}}\]
    (III) \[{{C}_{2}}{{H}_{5}}C{{H}_{3}}\]No hydrogen bonding and dipole -dipole interaction
    (IV)  \[{{C}_{2}}{{H}_{5}}OC{{H}_{3}}\]Dipole-Dipole Boiling points order is-  (III)< (IV) < (II) < (I).


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