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  4. The decreasing order of acidic character among ethane (I), ethene (II), ethyne (III) and propyne (IV) is

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Q. The decreasing order of acidic character among ethane $(I)$, ethene $(II)$, ethyne $(III)$ and propyne $(IV)$ is

KEAMKEAM 2010Hydrocarbons

Solution:

The correct order of decreasing acidity is
$ \underset{(III)}{\mathop{CH\equiv CH}}\,>\underset{(IV)}{\mathop{CH\equiv C-C{{H}_{3}}}}\,>\underset{(II)}{\mathop{C{{H}_{2}}=C{{H}_{2}}}}\, $
$ >\underset{(I)}{\mathop{C{{H}_{3}}-C{{H}_{3}}}}\, $
Hydrogen atoms attached to sp-hybridised carbon atom are most acidic, followed by those attached to $ s{{p}^{2}} $ hybridised carbon atom and those attached to $ s{{p}^{3}} $ hybridised carbon are least acidic.