Q. 184.9( 8 Votes )
Arrange benzene, n-hexane, and ethyne in decreasing order of acidic behaviour. Also, give a reason for this behaviour.
The acidic character of a species is defined as the ease with which it can lose its H- atoms.
The hybridization state of carbon in the given compounds is as shown below:-
Now, as the s–character increases, the electronegativity of carbon increases and the electrons of C–H bond pair lies closer to the carbon atom. As a result, the partial positive charge of H- atom increases and H+ ions are set free.
The s–character increases in the order:
sp3 < sp2 < sp
Hence, the decreasing order of acidic behaviour is: -
Ethyne > Benzene > Hexane.
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