Which structure corresponds to 1-propyn-3-ol?

To identify the correct structure for 1-propyn-3-ol, it is essential to understand the naming conventions used in organic chemistry. The name "1-propyn-3-ol" indicates that there is a three-carbon chain (prop-), with a triple bond (yn) at the first carbon, and an alcohol (-ol) group attached at the third carbon.

Breaking this down:

1. The "1-propyn" part signifies that there is a triple bond starting at carbon 1. This means the molecule has a structure with the following connectivity: carbon 1 has a triple bond to carbon 2, while carbon 3 will be connected to the hydroxyl (-OH) group.

2. The "3-ol" indicates that the -OH group is attached to the third carbon in the chain.

The correct structure CH≡C-CH-OH represents a three-carbon chain where the first carbon is triple-bonded to the second carbon, and the third carbon has an -OH group attached. Therefore, this matches the criteria laid out in the name 1-propyn-3-ol precisely.

The other options present structures that do not conform to this naming. For example, a