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  4. 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 mathringA but more than 1.34 mathringA The C-C bond angle will be:

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Q. 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\,\mathring{A}$ but more than $ 1.34 \,\mathring{A}$ The C-C bond angle will be:

Bihar CECEBihar CECE 2006Organic Chemistry – Some Basic Principles and Techniques

Solution:

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