Số đồng phân của este có công thức phân tử C4H6O2 được tạo ra từ axit fomic là  

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Một số câu hỏi khác có thể bạn quan tâm.

• Choose a word that has different stress pattern:

  educate                secondary                 ornament                     suspicious

• Choose a word that has different stress pattern:

  explain               gradually                     development                   profession

• Choose a word that has different stress pattern:

  opposite                  employed                      condition                   important

• Choose the best answer for the following sentence:

  We have been studying together for ten years now. We are ___________.
  
  

• Choose the best answer for the following sentence:

  Father: “Playing computer game for more than two hours a day is not good”
  Tuan: “I know, I’ll ________________ .”
  
  

• Choose the best answer for the following sentence:

  Water: "What would you like to drink, beer _____________ wine?”
  
  

• Choose the best answer for the following sentence:

  Hang: “Is this a good book?”

   Lan: "______________ " 
  
  

• Choose the best answer for the following sentence:

  Hung: "Which one do you prefer, going to the cinema or the cafe?”

  Thu: "___________________. "
  
  
  

• Choose the best answer for the following sentence:

  _____________ August 2008, the 29^th Olympic Games took place in China.

• Choose the best answer for the following sentence:

  It is impossible _________ water with oil.