$.$ For the formula $C_{10}{H}_{14},$ calculate the index of hydrogen deficiency $($IHD$)$ and select all the types of unsaturation that might be ${}^{J.}$ present in the molecule based on the IHD.

The IHD is

Which types of unsaturation might be present?

one double bond or one ring closing

many possibilities; most likely a benzene ring

three double bonds or three ring closings; or two double bonds and one ring closing; or one double bond and two ring closings; or one triple bond and one double bond; or one triple bond and one ring closing

no unsaturation; no multiple bonds or ring closings