Hello, Q.1. Why Benzene ring is said to be Activated when -OH Group is attached (Phenol) and Deactivated when -Cl Group is attached (Chloro Benzene), even when both the groups are having lone pair ? Q.2. Why anti-markovnikov''s rule is applicable only with Bromine and not with other Halogens ?

'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