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organic chemistry organic compounds properties of esters whatever islamic point of view science doctors organic isomerism isomerism isomers reactions of benzene aromaticity benzene benzene reactions chemistry compounds aromatic compounds resonance essect effect mesomerism mesomeric effect dipole-dipole interactions hydrogen bonding vanderwaals forces bonding hydrogen digestive digestion digestion of carbohydrates carbohydrates digestion carbohydrates every thing about esters. all about esters esters