pent-2-en-4-yne is
10σ10 \sigma10σ bonds and 3π3 \pi3π bonds
8σ8 \sigma8σ bonds and 5π5 \pi5π bonds
11σ11 \sigma11σ bonds and 2π2 \pi2π bonds
131313 σ\sigmaσ bonds and no π\piπ bonds
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