Is stereocentre and chiral centre same thing? Then how to calculate the number of stereocentres in the compound ch3ch=chchohchohch3?Wont the no. Of optical centres help us to get the answer? In this case, according to me the no. Of chiral c is 2(the 2 c attached to oh) and thus no. Ofoptical isomers is 4

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane