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Alex Granovsky
gran@classic.chem.msu.su

On Fri Feb 24 '12 8:43am, gensz wrote
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>I just want to ask if the multiplicity for the CH3CHCH3 from the addition of HBr to propene is 1?.thanks

Do you mean CH3CHCH3 or rather CH3-CHBr-CH3?

The first one is a radical and is a doublet (i.e. multiplicity=2) in its ground electronic state.
The second one is a singlet closed-shell molecule (i.e. multiplicity=1).

Regards,
Alex Granovsky