Question

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 $1.54\,?? but more than$ 1.34 ,?? $ The C-C bond angle will be:

• A. ${{109}^{o}}28$
• B. ${{100}^{o}}$
• C. ${{180}^{o}}$
• D. ${{120}^{o}}$

Answer 1

Answer: (D)

${{120}^{o}}$

Answer 2

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