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