Use the drop-down menus to name the following structures. 1st picture - ethyne, propene, 2-butene, or 2-butyne? 2nd picture - trans-3-pentene, cis-2-pentene, trans-2-hexene, or cis-3-hexene? 3rd picture - trans-3-nonene, cis-3-decene, trans-3-decene, or cis-3-nonene? 4th picture - 1-hexyne, 1-heptyne, 5,-hexyne, or 5-heptyne?

Structure 1:  2-Butyne

                  Parent chain contains 4 carbons and a triple bond. So, the parent name is Butyne. Position of triple bond is written 2, as triple bond starts at carbon 2.

Structure 2:  cis-2-Pentene

                   Parent chain contains 5 carbons and a double bond. So, the parent name is Pentene. Position of double bond is written 2, as double bond starts at carbon 2. As both substituents are on same side of double bond, so cis depicts the stereo.

Structure 3:  trans-3-Decene

                   Parent chain contains 10 carbons and a double bond. So, the parent name is Decene. Position of double bond is written 3, as double bond starts at carbon 3. As both substituents are on opposite side of double bond, so trans depicts the stereo.

Structure 3:  1-Hexyne

                    Parent chain contains 6 carbons and a triple bond. So, the parent name is Hexyne. Position of triple bond is written 1, as triple bond starts at carbon 1.