The reaction between carbonyl compound and `alpha`-bromoesters in the presence of metal Zn to give `beta`-hydroxy ester is known as:

Options

A. Clemmensen reduction
B. Reformatsky reaction
C. Wolff-Kishner reaction
D. Grignard reaction

Answer

To solve the question regarding the reaction between carbonyl compounds and alpha-bromoesters in the presence of zinc, leading to the formation of beta-hydroxy esters, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reactants**:
- The reactants in the reaction are a carbonyl compound (which can be an aldehyde or a ketone) and an alpha-bromoester.

2. **Understand the Role of Zinc**:
- Zinc acts as a reducing agent in this reaction. It interacts with the halide (bromine in this case) of the alpha-bromoester, facilitating the formation of a carbanion.

3. **Formation of Carbanion**:
- The zinc reacts with the alpha-bromoester, leading to the formation of a carbanion. This carbanion is nucleophilic and can attack the electrophilic carbonyl carbon of the carbonyl compound.

4. **Nucleophilic Attack**:
- The carbanion generated from the alpha-bromoester attacks the carbonyl carbon, resulting in the formation of a beta-hydroxy ester. This step involves the breaking of the carbonyl double bond and the formation of a new bond between the carbanion and the carbonyl carbon.

5. **Protonation**:
- After the nucleophilic attack, the intermediate formed can be protonated (typically by adding an acid) to yield the final product, which is a beta-hydroxy ester.

6. **Identify the Reaction Type**:
- The overall reaction can be classified as a nucleophilic substitution reaction, specifically a reaction known as the "Deformity reaction" or "Deformity reaction" (often referred to as the "De Forn-Midsy reaction"). This reaction is characterized by the formation of beta-hydroxy esters from carbonyl compounds and alpha-bromoesters in the presence of zinc.

### Final Answer:
The reaction between carbonyl compounds and alpha-bromoesters in the presence of zinc to give beta-hydroxy esters is known as the **De Forn-Midsy reaction**.