Why primary alcohols are more acidic than secondary alcohols?

Explanation

The structure of a primary alcohol and secondary alcohols

We know that acidic nature of compounds is based upon the removal of hydrogen ion i.e. `H^(+)` The easier the release of `H^(+)` ion, the more will be acidic strength. As we have seen in the structure above, there are two alkyl group in `2^@` -alcohol which are electron releasing in nature. So due to electron releasing effect i.e. + I effect, the electron density will be more on oxygen atom in `2^@` -alcohols as compare to `1^@` -alcohol. Large electron density on oxygen atom will hold hydrogen atom strongly and hence removal of `H^(+)` ion difficult in `2^@` alcohols. Hence `2^@` alcohols are less acidic than `1^@` -alcohols.