Q. The correct order of electronegativity of carbon in ethane, ethene and ethyne is
Organic Chemistry – Some Basic Principles and Techniques
Solution:
Hydrocarbons
Molecular formula
$\%$ s-character
Ethane
$CH _{3}- CH _{3}$
$25 \%$
Ethene
$CH _{2}== CH _{2}$
$33 \%$
Ethyne
$CH \equiv CH$
$50 \%$
As we know that, electronegativity $\propto \% S$-character $\propto$ acidic character Hence, correct order of electronegativity in the given compounds is,
ethane $<$ ethene $<$ ethyne.
| Hydrocarbons | Molecular formula | $\%$ s-character |
|---|---|---|
| Ethane | $CH _{3}- CH _{3}$ | $25 \%$ |
| Ethene | $CH _{2}== CH _{2}$ | $33 \%$ |
| Ethyne | $CH \equiv CH$ | $50 \%$ |