Please sir explain me this question. How chlorocyclohexane is more stable than dichlorocyclohexane?(see attachment)

'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 ?

Plz answer this query.....................................................................................................

how to represent the possible fischer projections for 2-bromohexane