Arrange benzene,n-hexane and ethyne in decrea | vedclass

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(D) The decreasing order of acidic behaviour is ethyne $>$ benzene $>$ $n$-hexane. The acidity of a hydrocarbon depends on the $s$-character of the hy

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Ethyne $>$ Benzene $> n$-hexane

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(D) The decreasing order of acidic behaviour is ethyne $>$ benzene $>$ $n$-hexane. The acidity of a hydrocarbon depends on the $s$-character of the hybridised carbon atom to which the hydrogen is attached. Higher $s$-character leads to higher electronegativity of the carbon atom,which makes the $C-H$ bond more polar and the resulting carbanion more stable. The hybridisation of carbon atoms in these compounds is as follows: Ethyne $(HC \equiv CH)$: $sp$ hybridised ($50\% \ s$-character). Benzene $(C_6H_6)$: $sp^2$ hybridised ($\approx 33.3\% \ s$-character). $n$-Hexane $(CH_3(CH_2)_4CH_3)$: $sp^3$ hybridised ($25\% \ s$-character). Therefore,the order of acidity is ethyne $>$ benzene $>$ $n$-hexane.

Arrange benzene,$n$-hexane and ethyne in decreasing order of their acidic behaviour.

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