Is it necessary in SN2 reaction that reactant should change its optical rotation along with its stereochemitry?If reactant is dextrorotatory then is it necessary that product should be levorotatory?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms Using above informationMatch the following

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What are the chapters we need to study before alcohols, phenols and ethers to understand it ?

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how to represent the possible fischer projections for 2-bromohexane