Organic tips

Just a quick tip: 

This is for the electrophilic substitution/ bromination for Phenols and Phenylamines.

1) Br2 (g) in CCl4 —-> mono-substituted phenol/phenylamine
2) Br2 (l)              —–> di-substituted phenol/phenylamine
3) Br2 (ag)           ——> tri-substituted phenol/phenylamine

Another quick revision tip:

Metal-acid reaction is also a reduction/oxidation process

Please remember that in Nucleophilic addition, a racemic mixture is most likely to be formed, unless the reaction is performed naturally by enzymes in living organisms