What is the correct relation between acidic strength of primary, secondary and tertiary alcohols?

1°>2°>3° 1°<2°<3° 1°>2°>3° 1°>3°>2°

1°>2°>3°

Alkyl groups are electron releasing groups and tend to increase the electron density on oxygen and reduce the polarity of O-H bond. So, the greater the number of alkyl groups present, lesser will be the tendency to release protons, and therefore weaker will be the acidic strength.