How to convert CH2CHCH3 to CH3CH(OH)COOH in not more than 3 steps

I was thinking about this:

Step 1.) oxidize the double bond to get CH3COOH

Thanks!

CH2=CH-CH3 is propene


CH2=CH-CH3 + O3/CH2Cl2 + Zn/H2O ---------> CH3-CHO (ethanal) + CH2O (methanal)

above reaction is ozonolysis ...

CH3-CHO + HCN ---------> CH3-CH(OH)-CN

CH3-CH(OH)-CN + H+/H2O ---------> CH3-CH(OH)-COOH

feel free to ask any question

I agree with AS on this one. I was initially thinking of converting the alkene to a glycol using OsO4 and then oxidizing this to the carboxylic acid using CrO3/H2SO4, but this is not a good method because cleavage of the glycol would predominate under these conditions. By the time I had thought of using AS's method, he/she had already answered the question and so deserves best answer. Pulkit's method is wrong in just about every aspect.

Step 1:- CH2CHCH3 +HBr(in peroxide)------> CH3CHBrCH3 [anti Markonikov's rule ]

Step 2:-CH3CHBrCH3+KMnO4 (acidic)------->CH3CHBrCooH [strong Oxidation ]

Final Step :- CH3CHBrCooH + KOH---------> CH3CH(OH)COOH