When phenol is treated wid bromine in presence of water, we get 1,3,5 tribromo phenol but when treated in presence of carbon sulphide, we get 1,3 dibromo phenol Why?

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

 

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how to represent the possible fischer projections for 2-bromohexane