[lip]

We know that CH3: - carbon is SP3 but in CH2:COCH3 hybridization is  SP2, so are there any rule to determine the hybridization ? or

should we consider it case by case, where in CH3:- it is SP3 because  electron pair repulsion , but in CH2:COCH3  it is SP2 because then it can delocalize the lone pair