ive posted the same 2 or 3 times but no reply yet!!

Can someone please explain the mechanism by which resorcinol

(1,3 dihydroxy benzene) undergoes iodoform reaction
 
Hope i get an answer this time

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

 

Using above information

Match the following 

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

how to represent the possible fischer projections for 2-bromohexane