Correct Answer: Option D

Explanation

Propene (C\(_3\)H\(_6\)) is an alkene that contains one carbon-carbon double bond (C=C) and one carbon-carbon single bond (C-C).

According to bonding rules: 

• A single bond consists of exactly one sigma (σ) bond.
• A double bond consists of one sigma (σ) bond and one pi (π) bond.

Because propene has only one double bond in its structure (CH\(_2\)=CH-CH\(_3\)), it contains exactly one pi bond.

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