The third member of the family of alkenynes has the molecular formula :-

Options

A. `C_(3)H_(2)`
B. `C_(5)H_(6)`
C. `C_(6)H_(8)`
D. `C_(4)H_(4)`

Answer

To determine the molecular formula of the third member of the family of alkenynes, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definition of Alkenynes**:
Alkenynes are hydrocarbons that contain both double bonds (alkenes) and triple bonds (alkynes). The general formula for alkenynes can be derived from the combination of these two types of bonds.

2. **Identify the General Formula**:
The general formula for alkenes is C_nH_(2n) and for alkynes is C_nH_(2n-2). For alkenynes, we can use a modified formula that accommodates both types of bonds.

3. **Determine the Number of Carbons in the Third Member**:
The first member of the alkenynes has 4 carbon atoms (C4). Each subsequent member adds 2 carbon atoms. Therefore:
- 1st member (C4): C4H6
- 2nd member (C6): C6H8
- 3rd member (C8): C8H10

4. **Calculate the Molecular Formula**:
For the third member, we will have 6 carbon atoms and the corresponding number of hydrogen atoms. The formula for the third member of alkenynes is C6H8.

5. **Final Answer**:
The molecular formula of the third member of the family of alkenynes is C6H8.