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(B) Acidic strength $\propto \ \% \ s$-character.The acidity of hydrogen atoms attached to carbon depends on the hybridization of the carbon atom. The

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$IV < I < III < II$

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(B) Acidic strength $\propto \ \% \ s$-character.The acidity of hydrogen atoms attached to carbon depends on the hybridization of the carbon atom. The order of electronegativity is $sp > sp^2 > sp^3$,which corresponds to $50\% \ s$,$33.3\% \ s$,and $25\% \ s$ character respectively.$1$. $CH \equiv CH$ $(II)$: $sp$ hybridized carbon ($50\% \ s$-character),most acidic.$2$. $CH_3-C \equiv CH$ $(III)$: Terminal alkyne,but the $+I$ effect of the $-CH_3$ group decreases the acidity compared to ethyne.$3$. $H_2C=CH_2$ $(I)$: $sp^2$ hybridized carbon ($33.3\% \ s$-character).$4$. $CH_3-CH_3$ $(IV)$: $sp^3$ hybridized carbon ($25\% \ s$-character),least acidic.Thus,the correct order of acidic strength is $IV < I < III < II$.

Arrange the following in the correct order of their acidic strength:
$I. H_2C=CH_2$ $II. CH \equiv CH$ $III. CH_3-C \equiv CH$ $IV. CH_3-CH_3$

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Arrange the following in the correct order of their acidic strength:$I. H_2C=CH_2$$II. CH \equiv CH$$III. CH_3-C \equiv CH$$IV. CH_3-CH_3$