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KVPY Sample Paper KVPY Stream-SX Model Paper-26

  • question_answer
    The correct statements about the compound \[{{H}_{3}}C(HO)HC-CH=CH-CH(OH)C{{H}_{3}}(X)\]are
    (I) the total number of stereoisomers possible for X is 6
    (II) The total number of diastereomers possible for X is 3
    (III) If the stereochemistry about the double bond in X is trans, the number of enantiomers possible for X is 4
    (IV) If the stereochemistry about the double bond in X is\[cis\], the number of enantiomers possible for X is 2

    A) (I), (III)

    B) (I), (II), (III)

    C) (I), (IV)

    D) (III), (IV)

    Correct Answer: C

    Solution :

    \[{{\operatorname{CH}}_{3}}-\overset{*}{\mathop{\underset{\underset{OH}{\mathop{|}}\,}{\mathop{C}}\,}}\,-CH=CH-\overset{*}{\mathop{\underset{\underset{OH}{\mathop{|}}\,}{\mathop{C}}\,}}\,H-C{{H}_{3}}\]
    Stereoisomer Configuration
    I d   cis    d
    II l    cis     l
    III d   cis    l
    IV d   trans d
    V l    trans  l
    VI d   trans  l
    Enantiomers  \[\operatorname{I}\,\underset{cis}{\mathop{and}}\,\,II;\,\,\,\,IV\,\underset{trans}{\mathop{and}}\,\,V\]
    Diastereomers \[\operatorname{I}\left( or\,II \right),III\left( or\,IV \right),Vand\,VI\] 
    Meso                 \[\operatorname{III}\,\operatorname{and}\,\operatorname{VI}\]


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