• # question_answer Examine the following common chemical structures to which simple functional groups are often attached (i) (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)

(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.