Which of the following is the chemical formula for octyne?

The correct chemical formula for octyne is C8H14. This is because octyne is an alkyne, which means it contains at least one carbon-carbon triple bond. Alkynes follow the general formula CnH2n-2, where n represents the number of carbon atoms. For octyne, with eight carbon atoms (n=8), the formula is calculated as C8H(2*8-2), which simplifies to C8H14.

This structure reflects the presence of the triple bond, limiting the number of hydrogens attached to the carbon backbone compared to alkenes and alkanes. Consequently, while other choices represent forms of hydrocarbons with different bonding structures (alkenes or alkanes), they do not accurately reflect the chemical properties of octyne.