9. What is the major product of the following reaction? (23.9) HO A OH HO A HO HO B с D 10. What is the major product of the following reactions? (23.9) 1) NaOCH2CH3/CH3CH2OH ? A B 2) CH3CH2CH21 C D 11. What is the major product of the following reaction? (23.9) H H A B ? H3O+ OH OH HO OH с D 12. What is the major product of the following reactions? (23.9) 1) NaOCH3/CH3OH 2) CH3(CH2)3Br 3) H3O+, A B ? OH OH C D