Question

Identify the structure of propyne

• A. \(HC \equiv \equiv \equiv CH\)
• B. \(H_3 C — C ≡≡≡CΗ\)
• C. \(H_2 C = CH — CH_3\)
• D. \(H_2 C = CH_2\)

Answer 1

The Correct Option is B

Propyne is an alkyne with the molecular formula \( C_3H_4 \). It contains a triple bond between two carbon atoms.
The correct structure is:
\( CH_3 - C \equiv CH \)
- It has three carbon atoms in a chain.
- A triple bond exists between the second and third carbon atoms.
- The first carbon is part of a methyl group (\( CH_3 \)).
Therefore, the correct structure of propyne is \( CH_3 - C \equiv CH \).

Answer 2

Propyne is a hydrocarbon with the molecular formula \(C_3H_4\). It belongs to the class of alkynes, which are characterized by the presence of a carbon-carbon triple bond. The structure of propyne can be outlined as follows:

• The prefix 'prop-' indicates the presence of three carbon atoms.
• The suffix '-yne' signifies the presence of a triple bond between two of these carbon atoms.
• The correct structure requires one carbon atom to be bonded to each of the other two carbon atoms with a triple bond located between the first and second carbon.

Therefore, the structural formula for propyne is represented by the option: \(H_3C — C ≡ CΗ\). This structure indicates:

• The first carbon (from the left) is bonded to three hydrogen atoms, forming a methyl group (\(CH_3\)).
• The second and third carbon atoms are linked by a triple bond (\(≡\)).
• The terminal carbon (third from the left) is linked to a single hydrogen atom (\(CH\)).