Question

Which is more acidic- Ethene or Ethyne. Why?

Answer 1

In ethyne,the Carbon atoms are in sp hybridization state with 50% s- character. As the s-charater increases , electronegativity of carbon atom increases. In this way Carbon atom i strongly attracts bond pair electrons of C-----H bond towards itself and ultimately $H^{+}$ ions can be easily donated.Hence,ethyne acts as acid.Where as in ethene carbon atom exbhit $S{P}^2$ hybridization.