Why primary alcohols are more acidic than secondary alcohols?

Explanation

The structures of a primary alcohol and secondary alcohol. are given as below:

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 structures above, there are two alkyl groups 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 compared to `1^(@)`-alcohols. Large electron density on oxygen atom will hold hydrogen atom strongly and hence removal of H+ ion is difficult in `2^(@)` - alcohols. Hence, `2^(@)` -alcoholsi are less acidic than `1^(@)`-alcohols.