The compound that undergoes ozonolysis to produce acetaldehyde and benzophenone is called benzaldehyde.

Explanation:
1. Ozonolysis: Ozonolysis is a chemical reaction that involves the cleavage of carbon-carbon double bonds or triple bonds using ozone (O3) as the oxidizing agent. This reaction is commonly used to identify the structure of unknown compounds.

2. Products: In this case, the ozonolysis of the unknown compound results in the formation of two products: acetaldehyde and benzophenone.

3. Acetaldehyde: Acetaldehyde is a simple aldehyde with the chemical formula CH3CHO. It is a colorless liquid with a pungent odor. Acetaldehyde is formed when the carbon-carbon double bond in the unknown compound is cleaved by ozone. One of the resulting fragments reacts with ozone to form acetaldehyde.

4. Benzophenone: Benzophenone is a ketone with the chemical formula (C6H5)2CO. It is a white crystalline solid with a characteristic odor. Benzophenone is formed when the other fragment resulting from the cleavage of the carbon-carbon double bond reacts with ozone. The reaction leads to the formation of a carbonyl group, resulting in the formation of benzophenone.

5. Benzaldehyde: Benzaldehyde is an aromatic aldehyde with the chemical formula C6H5CHO. It is a colorless liquid with a characteristic almond-like odor. Benzaldehyde is the compound that undergoes ozonolysis to produce acetaldehyde and benzophenone. The carbon-carbon double bond in benzaldehyde is cleaved by ozone, resulting in the formation of these two products.

Conclusion:
In summary, the unknown compound that gives acetaldehyde and benzophenone upon ozonolysis is benzaldehyde. The carbon-carbon double bond in benzaldehyde is cleaved by ozone, leading to the formation of acetaldehyde and benzophenone as the major products.