This hydrocarbon is an alkyne. The lewis structure is shown in the picture below.
Work Step by Step
This hydrocarbon is an alkyne because it contains a triple carbon-carbon bond. As the Lewis structure is drawn the way the formula is written, it can be seen that the second and the third carbon have only two bonds but a carbon should have four bonds. Thus, there should be a triple bond between second and third carbon. This makes it an alkyne.