Which of the following show glucose has aldehyde group

Options

A. It gives Tollen's reagent test
B. It gives Fehling's solution test
C. It gives Schiff's reagent test
D. It gives reaction with `NaHSO_(3)` and `NH_(3)`

Explanation

To determine which of the following tests show that glucose has an aldehyde group, we can analyze the reactions of glucose with specific reagents.

### Step-by-Step Solution:

1. **Understanding Glucose Structure**:
- Glucose is an aldohexose, meaning it contains an aldehyde group (-CHO) at one end of its carbon chain.

2. **Identifying the Tests**:
- The question refers to two specific tests: the Tollen's test and the Fehling's test. Both tests are used to identify aldehydes.

3. **Tollen's Test**:
- When glucose reacts with Tollen's reagent (which contains Ag(NH3)2+), it reduces the silver ions to metallic silver, forming a silver mirror. This indicates the presence of an aldehyde group.
- Reaction:
\[ \text{Glucose} + \text{Tollen's reagent} \rightarrow \text{Gluconic acid} + \text{Ag (silver mirror)} + \text{H2O} \]

4. **Fehling's Test**:
- Similarly, when glucose is treated with Fehling's solution (which contains Cu2+ ions), it reduces the blue copper(II) ions to red copper(I) oxide (Cu2O), indicating the presence of an aldehyde group.
- Reaction:
\[ \text{Glucose} + \text{Fehling's solution} \rightarrow \text{Red precipitate (Cu2O)} + \text{Gluconic acid} \]

5. **Conclusion**:
- Since glucose reacts positively with both Tollen's reagent and Fehling's solution, it confirms that glucose has an aldehyde group. Therefore, the correct options are those that refer to these tests.

### Final Answer:
- The tests that show glucose has an aldehyde group are **Tollen's test** and **Fehling's test**.