outline the mechanism for the reaction between propene and conc.H2 SO4?

Propene undergoes electrophilic addition with concentrated H₂SO₄ to form CH₃-CH(OSO₃H)-CH₃ as the major product and CH₃-CH₂-CH₂(0SO₃H) as the minor product. The mechanism is shown below.

When the major product is hydrolyzed, 2-propanol (or named as propan-2-ol) is produced.
When the minor product is hydrolyzed, 1-propanol (or named as propan-1-ol) is produced.

1. CH3-CH=CH2 + H+ --> CH2-CH+CH3 (major--Markovnikov's Rule.) 2. CH3CH+CH3 + H2O --> CH3CHOH2+CH2 --> CH3CHOHCH3 + H+. You do the minor product.