Examine the following common chemical structure, to which simple functional groups are often attached
(iv) \(CH_3 CH_2 CH_2 CH_{2^-}\)
(v) H2C = CH -
Which of these systems have essentially planar geometry?
(a) iv
(b) (i) and (v)
(c) (ii) and (iii)
(d) (ii), (iii) and (iv)