Question 1

Which functional group in the open-chain form of glucose is responsible for its reducing properties in the bromine water test?

Accepted Answer

Aldehyde group ($$-CHO)$$

Question 2

What is the main observable phenomenon when glucose solution is added to bromine water and the mixture is shaken?

Accepted Answer

The bromine water loses its color

Question 3

Which chemical equation correctly represents the oxidation of glucose by bromine water?

Accepted Answer

$$ \mathrm{CH_2OH[CHOH]_4CHO + Br_2 + H_2O \rightarrow CH_2OH[CHOH]_4COOH + 2HBr} $$

Question 4

Why can the bromine water test be used to distinguish glucose from fructose?

Accepted Answer

Fructose contains a ketone group that does not react with bromine water

Question 5

In the bromine water test, what is the organic product formed when glucose is oxidized?

Accepted Answer

Gluconic acid

Question 6

Which of the following statements about the bromine water test with glucose is INCORRECT?

Accepted Answer

The test can be used to distinguish glucose from formic aldehyde

Question 7

During the bromine water test, what happens to the bromine molecule ($$Br_2$$)?

Accepted Answer

It is reduced to hydrobromic acid ($$HBr)$$

Question 8

A student replaces glucose with fructose in the bromine water test. What is the expected observation?

Accepted Answer

No significant color change occurs

Question 9

Which of the following best explains why both glucose and fructose give a red precipitate with Benedict's solution after heating?

Accepted Answer

Both can tautomerize to form an aldehyde group under basic conditions

Question 10

In a practical test, a student adds NaOH and CuSO$$_4 to $$glucose and fructose solutions at room temperature. Both solutions turn blue. What does this indicate?

Accepted Answer

Both contain adjacent hydroxyl groups

Question 11

Which of the following statements is TRUE regarding the oxidation of glucose with bromine water?

Accepted Answer

Glucose is oxidized to gluconic acid, and bromine is reduced to hydrobromic acid

Question 12

Which step in the practical test allows you to distinguish between glucose and fructose?

Accepted Answer

Adding bromine water and observing color change

Question 13

Which of the following is NOT a skill practiced during the bromine water test with glucose?

Accepted Answer

Measuring melting points

Question 14

Which of the following statements about the reaction of glucose with bromine water is FALSE?

Accepted Answer

A red precipitate forms during the reaction

Question 15

Why can't the bromine water test be used to distinguish glucose from formic aldehyde?

Accepted Answer

Both substances decolorize bromine water

Question 16

Which of the following best describes the type of reaction occurring when glucose reacts with bromine water?

Accepted Answer

Oxidation-reduction (redox) reaction

Question 17

A student performs the following steps: adds NaOH and CuSO$$_4 to $$glucose and fructose solutions, then heats them. Both produce a red precipitate. What does this indicate?

Accepted Answer

Both are reducing sugars

Question 18

Which of the following is the correct sequence of observations when performing the bromine water test with glucose?

Accepted Answer

Bromine water is orange, then becomes colorless after adding glucose

Question 19

Which property of glucose is demonstrated by its reaction with bromine water?

Accepted Answer

Its reducing ability due to the presence of an aldehyde group

Question 20

In a test to distinguish between glucose and fructose, which result confirms the presence of glucose?

Accepted Answer

Bromine water loses its color after adding the sample

GOB Chemistry Study Guide: Glucose and Bromine Water Reactions

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