The aldehydes which will not form Grignard prodcut with one equivalent Grignard reagents are :

Options

A. C,D
B. B,C,D
C. B,C
D. B,D

Explanation

To determine which aldehydes will not form Grignard products with one equivalent of Grignard reagent, we need to analyze the reactivity of the aldehydes in question. Grignard reagents (RMgX) are strong nucleophiles and can react with electrophiles, including aldehydes. However, certain functional groups can interfere with this reaction.

### Step-by-Step Solution:

1. **Identify the Aldehydes**:
Let's consider the aldehydes mentioned in the options. The aldehydes typically have the functional group -CHO.

2. **Understand Grignard Reactions**:
Grignard reagents react with aldehydes to form alcohols. The general reaction is:
\[ R-MgX + R'-CHO \rightarrow R-CH(OH)-R' + MgX(OH) \]
However, if the aldehyde has an acidic hydrogen (like in carboxylic acids), the Grignard reagent will react with that hydrogen instead of the carbonyl carbon.

3. **Analyze Each Option**:
- **Option A**: An aldehyde without any acidic groups (e.g., CHO). This will react with Grignard reagent to form a Grignard product.
- **Option B**: An aldehyde with a carboxylic acid group (e.g., CHO-COOH). The Grignard reagent will react with the acidic hydrogen of the carboxylic acid instead of the carbonyl carbon, thus not forming a Grignard product.
- **Option C**: An aldehyde with no acidic groups (e.g., CHO-CH3). This will also react to form a Grignard product.
- **Option D**: An aldehyde with an alcohol group (e.g., CH2OH). The alcohol group can also have acidic properties, and thus the Grignard reagent may react with the hydrogen of the alcohol instead of the carbonyl carbon.

4. **Conclusion**:
The aldehydes that will not form Grignard products with one equivalent of Grignard reagent are those that have acidic protons that can react with the Grignard reagent. In this case, options B and D are the correct answers.

### Final Answer:
The aldehydes which will not form Grignard products with one equivalent of Grignard reagents are **B and D**.