Given below is a reaction catalysed by enzyme Z.
`overset(X)overset(|)C-overset(Y)overset(|)C overset(Z)rarr X-Y +C=C`
Choose the correct option with respect to the category of enzyme Z.

Options

A. Oxidoreductases
B. Transferases
C. Lyases
D. Hydrolases

Answer

To determine the category of enzyme Z in the given reaction, we need to analyze the reaction and understand the function of different classes of enzymes.

### Step-by-Step Solution:

1. **Identify the Reaction**: The reaction given is:
\[ \overset{X}{C} - \overset{Y}{C} \overset{(Z)}{\rightarrow} X - Y + C = C \]
Here, enzyme Z catalyzes the transformation of a compound into two products.

2. **Understand Enzyme Classes**: Enzymes are classified into six main categories based on their functions:
- **Oxidoreductases**: Catalyze oxidation-reduction reactions.
- **Transferases**: Transfer functional groups from one molecule to another.
- **Hydrolases**: Catalyze the hydrolysis of various bonds.
- **Lyases**: Catalyze the addition or removal of groups to form double bonds or rings.
- **Isomerases**: Catalyze the rearrangement of atoms within a molecule.
- **Ligases**: Catalyze the joining of two molecules with the use of ATP.

3. **Analyze the Given Reaction**: In the reaction, we see that the enzyme Z is facilitating the formation of a double bond (C=C) and the release of two products (X-Y). This suggests that a group is being removed or added to create a double bond.

4. **Determine the Correct Enzyme Class**: Since the reaction involves the formation of a double bond through the removal of a group (without the use of water), it indicates that enzyme Z is likely a **lyase**. Lyases are known for catalyzing the non-hydrolytic removal of groups to form double bonds.

5. **Conclusion**: Therefore, enzyme Z belongs to the category of **lyases**.

### Final Answer:
Enzyme Z is classified as a **lyase**.