Which of the following statements about D(+) glucose is/are true?

Options

A. Naturally occurring glucose is dextrorotatory
B. It reduce ammoniacal `AgNO_(3)` solution
C. On polymerisation it forms galactose
D. It forms cyanohydrin on reaction with HCN

Answer

To determine which statements about D(+) glucose are true, we will analyze each statement one by one.

### Step 1: Analyze Statement A
**Statement A:** Naturally occurring glucose is dextrorotatory.

- **Explanation:** D(+) glucose is indeed dextrorotatory, meaning it rotates plane-polarized light to the right. This is a characteristic of naturally occurring glucose.
- **Conclusion:** This statement is **true**.

### Step 2: Analyze Statement B
**Statement B:** It reduces ammoniacal silver nitrate solution.

- **Explanation:** D(+) glucose contains an aldehyde group, which can reduce ammoniacal silver nitrate (Tollens' reagent). Therefore, glucose can indeed reduce this solution.
- **Conclusion:** This statement is **true**.

### Step 3: Analyze Statement C
**Statement C:** On polymerization, it forms galactose.

- **Explanation:** D(+) glucose does not polymerize to form galactose. Instead, it polymerizes to form polysaccharides such as starch or cellulose. Galactose is a different monosaccharide.
- **Conclusion:** This statement is **false**.

### Step 4: Analyze Statement D
**Statement D:** It forms cyanohydrin on reaction with HCN.

- **Explanation:** D(+) glucose can react with hydrogen cyanide (HCN) to form cyanohydrin due to the presence of the aldehyde group. This reaction is characteristic of aldehydes.
- **Conclusion:** This statement is **true**.

### Final Conclusion
Based on the analysis:
- **True Statements:** A, B, and D
- **False Statement:** C

Thus, the true statements about D(+) glucose are A, B, and D.

### Summary of True Statements:
- A: True
- B: True
- C: False
- D: True