Đốt cháy hoàn toàn một ancol đơn chức (R) thì thu được 8,8 gam khí CO2 và 4,5 gam H2O.

a/ Viết PTHH xảy ra và xác định CTPT của R.

b/ Viết các CTCT có thể có của R và gọi tên theo danh pháp thay thế.

19. The ASEAN Free Trade Area (AFTA) is an agreement by the member nations of ASEAN concerning local manufacturing in all ASEAN countries. a. progressing b. producing c. combining d. aiming 20. ASEAN has planned equitable economic development and reduced poverty and _______ disparities in year 2020. a. socio-politic b. socio-cultural c. socio-linguistic d. socio-economic 21. The Governments of ASEAN have paid special attention _______ trade. a. to b. on c. for d. with 22. The goal the ASEAN Vision 2020 aims _______ creating a stable, prosperous and highly competitive ASEAN economic region. a. for b. on c. at d. up 23. _______, I will give him the report. a. When he will return b. When he returns c. Until he will return d. No sooner he returns 24. _______ the firemen arrived to help, we had already put out the fire. a. Until b. No sooner c. By the time d. After 25. I have earned my own living _______ I was seven. a. since b. when c. while d. as soon as 26. We saw many beautiful birds _______ in the lake. a when we are fishing b. while fishing c. while fished d. fishing 27. _______, Peter came to see me. a. While having dinner b. While I was having dinner c. When having dinner d. When lam having dinner 28. _______ my homework, I went to bed. a. After I had finished b. After finished c. Finished d. After had finished 29. _______ the dance, Jerry said good-bye to his girlfriend. a. Before left b. Before he leaves c. Before leaving d. Before he will leave 30. Jones _______ after everyone _______. a. speaks/ will eat b. will speak/ has eaten c. is speaking/ eats d. has spoken/ will have eaten 31. _______, Joe stays in bed and reads magazines. a. Whenever raining b. As it will be raining c. When it will rain d. Whenever it rains Error Identification.