Among the following compounds, the strongest acid is :

Options

A. `HC-=CH`
B. `C_(6)H_(6)`
C. `C_(2)H_(6)`
D. `CH_(3)OH`

Explanation

Orderof acidic strength among organic molecules is : `CH_(3)OH gt HC-=CH gt C_(6)H_(6)gt C_(2)H_(6)`. Here, benzene and ethane will exhibit theoretical acidic strength and both of them are not really acidic from an experimental point of view. However, as the hydrogens in benzene are bonded to `sp^(3)` carbons, the former will exhibit higher acidic strength than the latter. Here, all the mentioned molecules will experimentally be neutral towards litmus paper.