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 alkenyne family, we can follow these steps:

### Step 1: Understand the Structure of Alkenynes
Alkenynes are hydrocarbons that contain at least one carbon-carbon double bond (alkene) and at least one carbon-carbon triple bond (alkyne). The general formula for alkenynes can be derived from the number of carbon atoms (C) and the number of hydrogen atoms (H).

### Step 2: Identify the First Member of the Alkenyne Family
The first member of the alkenyne family is 1-butyne, which has 4 carbon atoms and the molecular formula C4H6.

### Step 3: Identify the Second Member of the Alkenyne Family
The second member can be formed by adding a CH2 group to the first member. This gives us 5 carbon atoms and the molecular formula C5H8.

### Step 4: Identify the Third Member of the Alkenyne Family
To find the third member, we add another CH2 group to the second member. This results in 6 carbon atoms and the molecular formula C6H8.

### Step 5: Conclusion
Thus, the molecular formula of the third member of the alkenyne family is C6H8.

### Final Answer:
The molecular formula of the third member of the alkenyne family is C6H8.

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