JEE Main & Advanced Chemistry Hydrocarbons Question Bank Critical Thinking

  • question_answer \[Ca{{C}_{2}}+{{H}_{2}}O\to A\xrightarrow{{{H}_{2}}S{{O}_{4}}/HgS{{O}_{4}}}B\]. Identify A and B in the given reaction [CPMT 2000; BVP 2004]

    A) \[{{C}_{2}}{{H}_{2}}\]and \[C{{H}_{3}}CHO\]

    B) \[C{{H}_{4}}\]and \[HCOOH\]

    C) \[{{C}_{2}}{{H}_{4}}\]and\[C{{H}_{3}}COOH\]

    D) \[{{C}_{2}}{{H}_{2}}\]and \[C{{H}_{3}}COOH\]

    Correct Answer: A

    Solution :

               Wohler reaction :                    \[Ca{{C}_{2}}+2{{H}_{2}}O\xrightarrow{{}}{{C}_{2}}{{H}_{2}}+Ca{{(OH)}_{2}}\] \[\underset{\text{Acetylene}}{\mathop{{{C}_{2}}{{H}_{2}}}}\,\underset{{{60}^{o}}C}{\mathop{\xrightarrow{dil.\,{{H}_{2}}S{{O}_{4}}/HgS{{O}_{4}}}}}\,\underset{\text{Unstable}}{\mathop{[C{{H}_{2}}=CHOH]}}\,\to \underset{\text{Acetaldehyde}}{\mathop{C{{H}_{3}}CHO}}\,\]


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