10th Class Science Carbon and its Compounds / कार्बन और उसके यौगिक Question Bank Carbon and Its compounds

  • question_answer
    An organic compound X with molecular formula, \[{{C}_{2}}{{H}_{6}}O\]on oxidation with potassium dichromate and sulphuric acid gives an acidic compound Y. The compounds X and Y react on warming in presence of cone. \[{{H}_{2}}S{{O}_{4}}\]to give a sweet smelling compound Z. What are the compounds X, Y and Z?

    A)
    X Y Z
    \[{{C}_{2}}{{H}_{5}}OH\] \[C{{H}_{3}}COOH\] \[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\]
                   

    B)
    X Y Z
    \[{{C}_{2}}{{H}_{5}}OH\] HCOOH \[HCOO{{C}_{2}}{{H}_{5}}\]
     

    C)
    X Y Z
    \[{{C}_{2}}{{H}_{5}}OH\] \[{{C}_{2}}{{H}_{5}}COOH\] \[{{C}_{2}}{{H}_{5}}COO{{C}_{2}}{{H}_{5}}\]
                   

    D)
    X Y Z
    \[{{C}_{2}}{{H}_{5}}OH\] \[C{{H}_{3}}CHO\] \[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\]

    Correct Answer: A

    Solution :

    \[\underset{X(Ethanol)}{\mathop{C{{H}_{3}}C{{H}_{2}}OH}}\,\xrightarrow[Heat]{acidified\,{{K}_{2}}C{{r}_{2}}{{O}_{7}}}\underset{Y\,(Acetic\,acid)}{\mathop{C{{H}_{3}}COOH}}\,\] This is known \[\underset{(Y)}{\mathop{C{{H}_{3}}COOH}}\,+\underset{(X)}{\mathop{C{{H}_{3}}C{{H}_{2}}OH}}\,\xrightarrow[Heat]{conc.{{H}_{2}}S{{O}_{4}}}\] \[\underset{Ethyl\,acetate\,(Ester)}{\mathop{C{{H}_{3}}COOC{{H}_{2}}C{{H}_{3}}}}\,\] This is known as esterification reaction.                


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