question_answer

Cyclic hydrocarbon 'A' has all the carbon and hydrogen atoms in a single plane. All the carbon carbon bonds have the same length, less than \[1.54\,\overset{{}^\circ }{\mathop{A}}\,,\] but more than \[1.34\,\overset{{}^\circ }{\mathop{A}}\,.\] The\[C-C-C\] bond angle will be

A) \[109{}^\circ 28'\]        

B)        \[100{}^\circ \]

C) \[180{}^\circ \]            

D) \[120{}^\circ \]

Correct Answer: D

Solution :

[d] All the properties mentioned in the question suggest that it is a benzene molecule. Since in benzene all carbons are \[s{{p}^{2}}-\]hybridized, therefore, C - C - C angle is \[120{}^\circ \]