Please explain to me when we use Clemmension reduction method andwolff-kishner reduction method ( when only a compound is given to be reduced and no informatio about the solvents or medium used )

'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