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Arrange benzene, n-hexane and ethyne in decreasing order of acidic behaviour. Also give reason for this behaviour. 

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Acidic character of a species is defined on the basis of ease with which it can lose its H atoms. 

The hybridization state of carbon in the given compound is: 

As the s–character increases, the electronegativity of carbon increases and the electrons of C–H bond pair lie closer to the carbon atom. As a result, 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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