Stamp Duty & Registration........

I have purchased Under Construction Flat  in FY 2010-11........(Possesion expected in FY 2011-12).........

1)Can I claim IT exmption for paid stamp duty & registration fee.....????

2) If Yes......still when the case is.........If I have taken home loan &......80% i.e.: Bank part of property cost -do include  stamp duty & registration fee also (this is when intrest will be paid forsaid 80% part& IT exmption will be taken in subsequent yrs...)...............????