I just want to thank all the SDN members who had helped me with my questions for DAT.....Well I have few more stupid question.... How can I know what reactions have major and minor products???? SO you guys memorized all the rxns??? how did u guys do that....I memorized the rxn from Kaplan flash cards but when I took the Subject tests and mid-terms I still go them wrong.... One more thing...WHAT IS A DIMER?????? are there questions on IR on DAT???? Thanks u all..