Why primary alcohols are more acidic than secondary alcohols?

Explanation

The structure of a primary alcohol and secondary alcohols
`underset(1^@-"alcohol")(CH_3 rarr underset(H)underset(|)overset(H)overset(|)C rarr O-H)" "underset(2^@-"alcohol")(H_3C rarr underset(H)underset(|)overset(CH_3)overset(|)C rarr> O-H)`
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.