Which of the following compounds contain all the carbon atoms in the same hybridisation state ?

Options

A. `H - C -= C - -= C - H`
B. `CH_(3) - C -= C - CH_(3)`
C. `CH_(2) = C = CH_(2)`
D. `CH_(2) = CH - CH = CH_(2)`

Answer

A, D

Explanation

Hybridisation of carbon atoms in different compounds is showm below
(a) `underset(sp)(HC) -= underset(sp)(C) - underset(sp)(C) -= underset(sp)(CH)` (b) `underset(sp^(3))(CH_(3)) - underset(sp)(C) -= underset(sp)(C) - underset(sp^(3))(CH_(3))`
(c) `underset(sp^(2))(CH_(2)) = underset(sp)(C) = underset(sp^(2))(CH_(2))`
(d) `underset(sp^(2))(CH_(2)) = underset(sp^(2))(CH) - underset(sp^(2))(CH) = underset(sp^(2))(CH_(2))`
In options (a) and (d), all cabon atoms are in same hybridisation state i.e., in `sp " and " sp^(2)` hybridisation respectively.