Những phản ứng hóa học nào chứng minh rằng glucozơ có chứa 5 nhóm hydroxyl

Những phản ứng hóa học nào chứng minh rằng glucozo có chứa 5 nhóm hydroxyl trong phân tử:

A.

A: Phản ứng tạo 5 chức este trong phân từ

B.

B: Phản ứng tráng gương và phản ứng lên men rượu

C.

C: Phản ứng tạo kết tủa đỏ gạch với Cu(OH)2 khi đun nóng và phản ứng lên men rượu

D.

D: Phản ứng cho dung dịch màu xanh lam ở nhiệt độ phòng với Cu(OH)2

Đáp án và lời giải

Đáp án:A

Lời giải:

đáp án đúng là A

Câu hỏi thuộc đề thi sau. Bạn có muốn thi thử?

Bài tập trắc nghiệm 15 phút Tính chất hóa học Glucozơ - Glucozơ - Hóa học 12 - Đề số 5

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Một số câu hỏi khác cùng bài thi.

• Chất nào sau đây có phản ứng tráng gương?

• Cho 9,0gam glucozophảnứnghoàntoànvớilượng dư dung dịch

  trong
  (đun nóng), thu được m gam Ag. Giá trị củam là:

• Chất không thủy phân trong môi trường axit là:

• Cho 50ml dung dịch glucozơ chưa rõ nồng độ tác dụng với một lượng dư AgNO3 trong dung dịch NH3 thu được 2,16 gam Ag kết tủa. Nồng độ mol của dung dịch glucozơ đã dùng là ?

• Lên men m gam glucozơ (hiệusuất 75%) thànhancoletylicvàkhí CO2. Dẫntoànbộlượng CO2 nàyvàobìnhđựngnướcvôitrongthấytách ra 40 gam kếttủavà dung dịch X. Thêmtừtừ dung dịch NaOH vào dung dịch X đếnkhilượngkếttủatốiđathìdừnglạivàsửdụnghết 0,04 mol NaOH. Giátrịcủa m là:

• Cho sơđồchuyểnhóasau: Tinhbột → X → Y → axitaxetic. X và Y lầnlượtlà

• Lên men 360 gam glucozơ với hiệu suất phản ứng là 80% thu được V ml C2H5OH 46° (khối lượng riêng của C2H5OH là 0,8 gam/ml). Giá trị của V là:
  

• Cho m gam glucozo phản ứng hoàn toàn với lượng dư dung dịch

  trong
  (đun nóng), thu được 21,6 gam Ag. Giá trị của m là:

• Đung nóng 100 gam dung dịch Glucozơ 18% với lượng dư dung dịch AgNO3 trong NH3 đến khi phản ứng xảy ra hoàn toàn thu được m gam Ag. Giá trị của m là:

• Những phản ứng hóa học nào chứng minh rằng glucozo có chứa 5 nhóm hydroxyl trong phân tử:

Một số câu hỏi khác có thể bạn quan tâm.

• Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions below:

  As heart disease continues to be the number-one killer in the United States, researchers have become increasingly interested in identifying the potential risk factors that trigger heart attacks. High-fat diets and "life in the fast lane" have long been known to contribute to the high incidence of heart failure. But according to new studies, the list of risk factors may be significantly longer and quite surprising.

  Heart failure, for example, appears to have seasonal and temporal patterns. A higher percentage of heart attacks occur in cold weather, and more people experience heart failure on Monday than on any other day of the week. In addition, people are more susceptible to heart attacks in the first few hours after waking. Cardiologists first observed this morning phenomenon in the mid-1980, and have since discovered a number of possible causes. An early-morning rise in blood pressure, heart rate, and concentration of heart stimulating hormones, plus a reduction of blood flow to the heart, may all contribute to the higher incidence of heart attacks between the hours of 8:00 A.M. and 10:00 A.M.

  In other studies, both birthdays and bachelorhood have been implicated as risk factors. Statistics reveal that heart attack rates increase significantly for both females and males in the few days immediately preceding and following their birthdays. And unmarried men are more at risk for heart attacks than their married counterparts. Though stress is thought to be linked in some way to all of the aforementioned risk factors, intense research continues in the hope of further comprehending why and how heart failure is triggered.

  Question:What does the passage mainly discuss?

• Có bao nhiêu đoạn thẳng được tạo thành từ

  điểm phân biệt khác nhau.

• As heart disease continues to be the number-one killer in the United States, researchers have become increasingly interested in identifying the potential risk factors that trigger heart attacks. High-fat diets and "life in the fast lane" have long been known to contribute to the high incidence of heart failure. But according to new studies, the list of risk factors may be significantly longer and quite surprising. Heart failure, for example, appears to have seasonal and temporal patterns. A higher percentage of heart attacks occur in cold weather, and more people experience heart failure on Monday than on any other day of the week. In addition, people are more susceptible to heart attacks in the first few hours after waking. Cardiologists first observed this morning phenomenon in the mid-1980, and have since discovered a number of possible causes. An early-morning rise in blood pressure, heart rate, and concentration of heart stimulating hormones, plus a reduction of blood flow to the heart, may all contribute to the higher incidence of heart attacks between the hours of 8:00 A.M. and 10:00 A.M. In other studies, both birthdays and bachelorhood have been implicated as risk factors. Statistics reveal that heart attack rates increase significantly for both females and males in the few days immediately preceding and following their birthdays. And unmarried men are more at risk for heart attacks than their married counterparts. Though stress is thought to be linked in some way to all of the aforementioned risk factors, intense research continues in the hope of further comprehending why and how heart failure is triggered. According to the passage, which of the following is NOT a possible cause of many heart attacks?

• Có

  người gồm
  nam và
  nữ. Số cách chọn
  người trong đó có đúng
  nữ là:

• Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions below:

  As heart disease continues to be the number-one killer in the United States, researchers have become increasingly interested in identifying the potential risk factors that trigger heart attacks. High-fat diets and "life in the fast lane" have long been known to contribute to the high incidence of heart failure. But according to new studies, the list of risk factors may be significantly longer and quite surprising.

  Heart failure, for example, appears to have seasonal and temporal patterns. A higher percentage of heart attacks occur in cold weather, and more people experience heart failure on Monday than on any other day of the week. In addition, people are more susceptible to heart attacks in the first few hours after waking. Cardiologists first observed this morning phenomenon in the mid-1980, and have since discovered a number of possible causes. An early-morning rise in blood pressure, heart rate, and concentration of heart stimulating hormones, plus a reduction of blood flow to the heart, may all contribute to the higher incidence of heart attacks between the hours of 8:00 A.M. and 10:00 A.M.

  In other studies, both birthdays and bachelorhood have been implicated as risk factors. Statistics reveal that heart attack rates increase significantly for both females and males in the few days immediately preceding and following their birthdays. And unmarried men are more at risk for heart attacks than their married counterparts. Though stress is thought to be linked in some way to all of the aforementioned risk factors, intense research continues in the hope of further comprehending why and how heart failure is triggered.

  Question: The phrase "susceptible to" in line 8 could best be replaced by_________

• Một hộp chứa

  viên bi xanh và
  viên bi đỏ. Lấy ngẫu nhiên
  bi. Tính xác suất để
  bi lấy được có đủ hai màu.

• Read the following pasage and mark the letter A, B, C or D to indicate the correct answer to each of the questions:

  In science, a theory is a reasonable explanation of observed events that arerelated. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example ofthisis found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.

  A useful theory, in addition to explaining past observation, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists' predictions, the theory issupported. If observations do not confirm the predictions, the scientists must search further.There may be a fault in the experiment, or the theory may have to be revised or rejected.

  Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said: "Science is built with facts just as a house is built withbricks, but a collection of facts cannot be called science any more than a pile ofbrickscan be called a house."

  Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses.In a way, any hypothesis is a leap into the unknown. It extends the scientist's thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. For without hypotheses, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories.

  Question: According to the second paragraph, a useful theory is one that helps scientists to _______.

• Số cách chọn một ban chấp hành gồm một trưởng ban, một phó ban, một thư kí và một thủ quỹ được chọn từ

  thành viên là:

• Khai triển biểu thức

  theo công thức nhị thức Newton với số mũ của x giảm dần. Số hạng thứ 3 trong khai triển là

• Read the following pasage and mark the letter A, B, C or D to indicate the correct answer to each of the questions:

  In science, a theory is a reasonable explanation of observed events that arerelated. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example ofthisis found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion.

  A useful theory, in addition to explaining past observation, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists' predictions, the theory issupported. If observations do not confirm the predictions, the scientists must search further.There may be a fault in the experiment, or the theory may have to be revised or rejected.

  Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said: "Science is built with facts just as a house is built withbricks, but a collection of facts cannot be called science any more than a pile ofbrickscan be called a house."

  Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses.In a way, any hypothesis is a leap into the unknown. It extends the scientist's thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. For without hypotheses, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories.

  Question: The word "supported" in paragraph 2 is closest in meaning to _______.