Question

Why alkynes are slightly more soluble than alkenes and alkanes

Answer 1

And so the alkyne is moreelectronegative than the other alkene and alkane . ... So, the alkyne is morepolar than alkene and alkane, and hence is slightly more soluble in water ,which is a polar solvent.

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Answer 2

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Due to greater electronegativity of C-atom in alkyne, the π-electrons are more tightly held in the triple bond then the π-electrons of double bond in alkene and sigma electrons of alkane. So, the alkyne is more polar than alkene and alkane, and hence is slightly more soluble in water ,which is a polar solvent.