BCECE Medical BCECE Medical Solved Papers-2014

  • question_answer Match the following
      Column - I   Column - II
    [a] Acetaldehyde, vinyl alcohol 1. Enantiomers
    [b] Eclipsed and staggered ethane 2. Tautomers
    [c] (+)2-butanol, (-)2-butanol 3. Chain isomers
    [d] Methyl-n-propylamine and diethylamine 4. Conformational isomers
        5. Metamers
     

    A)      A-1      B-4      C-3       D-5

    B)      A-2      B-4      C-1       D-5

    C)      A-5      B-1       C-4        D-2

    D)       A-5     B-1      C-3       D-2

    Correct Answer: B

    Solution :

    \[\underset{acetaldehyde}{\mathop{C{{H}_{3}}CHO}}\,\xrightarrow{Tautomerisation}\underset{vinyl\text{ }alcohol}{\mathop{C{{H}_{2}}=CH-OH}}\,\] Thus, these two are tautomers. Eclipsed and staggered ethane are two conformations of ethane. (+) 2-butanol and (-)2-butano are enantiomers as these are non-superimposable mirror images.                 \[\underset{(methyl-n-propyl\text{ }amine)}{\mathop{C{{H}_{3}}NH{{C}_{3}}{{H}_{7}}}}\,\] and        \[\underset{(diethylamine)}{\mathop{{{C}_{2}}{{H}_{5}}NH{{C}_{2}}{{H}_{5}}}}\,\] Due to difference in the nature of alkyl Groups attached to the same functional group, these are called metamers.

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