BCECE Engineering BCECE Engineering Solved Paper-2006

  • question_answer
    A cyclic hydrocarbon molecule has all the carbon and hydrogen is a single plane. All the carbon-carbon bonds are of same length, less than\[1.54\,\overset{\text{o}}{\mathop{\text{A}}}\,,\] but more than \[1.34\overset{\text{o}}{\mathop{\text{A}}}\,.\] The C-C bond angle will be:

    A) \[{{109}^{o}}28\]             

    B)         \[{{100}^{o}}\]

    C)  \[{{180}^{o}}\]

    D)         \[{{120}^{o}}\]

    Correct Answer: D

    Solution :

    Cyclic hydrocarbon, with carbon-carbon bond length between \[1.34\overset{\text{o}}{\mathop{\text{A}}}\,\]and \[1.54\overset{\text{o}}{\mathop{\text{A}}}\,\text{,}\] is benzene in which due to resonance, C-C, bond length is \[1.39\overset{\text{o}}{\mathop{\text{A}}}\,\](i. e., between\[1.34\overset{\text{o}}{\mathop{\text{A}}}\,-1.54\,\overset{\text{o}}{\mathop{\text{A}}}\,\]). Benzene is a hexagonal molecule with bond-angle equal to \[{{120}^{o}}.\]


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