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Which ouu of ethyne and propyne is more ...

Which ouu of ethyne and propyne is more acidic any why ?

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In ethyne `(HC-=CH)` , there are two terminal hydrogen atoms whereas , in propyne `(CH_3C-=CH)` there is only one. Apart from this, one electron-donating `-CH_3` group is attached to the carbon atom present on the other side of the triple bond in the propyne molecule. This decreases the acidity of the alkynyl hydrogen atom. so, ethyne is more acidic than propyne.
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