(ii) 
(iii) 
(iv) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}-\] (v) \[{{H}_{2}}C=C<\begin{matrix} H \\ H \\ \end{matrix}\] Which of these systems have essentially planar geometry [CBSE PMT 1995]
A) (i) and (v)
B) (ii) and (iii)
C) (ii), (iii) and (iv)
D) (iv)
Correct Answer: A
Solution :
(i) Benzene and its derivatives are always planar because all the carbon in benzene are \[s{{p}^{2}}\] hybridized. (v) \[C{{H}_{2}}=C<\begin{matrix} H \\ H \\ \end{matrix}\] Both the carbon are \[s{{p}^{2}}\] hybridized. Therefore planar.
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