Which of the following ions derived from`(1,3,5,7)`-cyclooctatetraene `(C_(8)H_(8))` by adding or removing a suitable number of `pi` electrons are aromatic?
(i). `C_(8)H_(8)^(2-)`
(ii). `C_(8)H_(8)^(+)`
(iii). `C_(8)H_(8)^(2+)`
(iv). `C_(8)H_(8)^(-)`

Options

A. (i),(iii)
B. (ii),(iv)
C. (ii),(iii),.(iv)
D. (i),(ii),(iii)

Answer

1

Explanation

`C_(8)H_(8)` has `8pie^(-)s(i.e.,4npie^(-)s)`. By adding `2e^(-)(10pie^(-)s)` or by removing `2e^(-)(6pie^(-)s)`, i.e., `(4n+2)pie^(-)s` it becomes aromatic.