WHat do you mean by this statement? electron pair should be present in pure p orbital not in hybrid orbital for resonance?

'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