Đun nóng nhẹ metylbenzen với hỗn hợp HNO3 trong H2SO4 đậm đặc thu được ba sản phẩm ortho, para và meta theo tỉ lệ phần trăm về khối lượng là 56%; 41% và 3%. Khả năng thế tương đối nguyên tử hiđro ở các vị trí ortho, para và meta có tỉ lệ theo thứ tự là

Các câu hỏi liên quan

Ex 7: Finish the following sentences in such a way that it’s as similar in meaning to the original sentences. 1. I love to read books very much. => I enjoy………………………………………………. 2. I often went to the cinema at weekends. => I used………………………………………………. 3. Shall we go to the movies tonight ? =>He suggests………………………………………………. 4. Can you help me? =>Do you mind………………………………………………. 5. He doesn’t find any difficult to get up early. =>He is used to………………………………………………. 6 Nam is too young to see the horror film. =>Nam is not………………………………………………. 7. I do this exercise in three and a half hours. => It takes……………………………………………………. 8. I like cartoon film. => It’s interested in……………………………………………… Ex8: Choose the best answer. 1. Would you like……… (have) something to eat? A. having B. to have C. have D. to having 2. My teacher made me………. (answer) the questions. A. answering B. to answer C. answer D. answers 3. He used……. (play) games every day but now he gives up……….(play) A. to play…play B. to play…… playing C. play …. play D. playing....play 4. It’s difficult…………. (get) used to……(eat) with chopsticks? A. to get…eating B. to get…… to eat C. get …. eat D. get....eating 5. They prefer…….. (watch) film to drama. A. watch B. watching C. to watch D. to watching 6. We decided …….. (rent) a houses with a swimming pool. A. rent B. renting C. rend D. to rent 7. Let me …….. (pay) a meal. You paid last time. A. rent B. renting C. rend D. to rent 8. I hate …….. (see) a child……… (cry) A. see…cry B. to see…to cry C. seeing…crying D. to see…to cry 9. Can you help me……….(get) the dinner ready? A. get B. getting C. to get D. got 10. I’ve enjoyed……..(meet) you. I hope……(see) you again. A. meet…see B. meeting ....to see C. meeting…seeing D. to meet…to see GIÚP MK BÀI NÀY VS cám ơn trc nhaaaa