Cyclohexene and 2-hexyne both have the molecular formula C₆H₁₀. Any of the following regions of an IR spectrum could be used to distinguish these two compounds.
3020-3100 cm^-¹
2100-2260 cm^-¹
1650-1670 cm^-¹

Question

Quizplus · Accepted Answer

The regions of an IR spectrum that could be used to distinguish between two compounds are often related to the functional groups present in each compound. In this case, cyclohexene has a C=C double bond, which typically shows a strong absorption in the 3020-3100 cm-1 region of the IR spectrum. 2-hexyne has a C≡C triple bond, which typically shows a strong absorption in the 2100-2260 cm-1 region of the IR spectrum. Therefore, only the first region listed (3020-3100 cm-1) could be used to distinguish between these two compounds. The other two regions listed do not contain absorptions that are specific to either compound.

Cyclohexene and 2-Hexyne Both Have the Molecular Formula C6H10

Cyclohexene and 2-Hexyne Both Have the Molecular Formula C₆H₁₀