Question

The structure of But-3-yn-1-ol is :
A.
B.
C.
D.

Answer 1

In the above structure, we can see the OH group must attach with the first carbon and the triple bond must attach with the third carbon. Because in the question we can see But-3-yn-1-ol in this yn represent the triple bond and ol represent alcohol.

Complete step by step answer:
In this structure the presence of four carbon atoms so “but” and alcohol group attached to the first carbon atom so “1-ol” and triple bond present in the third carbon atom so “3-yn”. This structure is named as But-3-yn-1-ol.
In this structure the presence of four carbon atoms and alcohol group is attached with a second carbon and triple bond present in the third carbon atom. This structure is named as But-3-yn-2-ol.
In this structure the presence of four carbon atoms and alcohol group is attached to the first carbon and triple bond attached with the first carbon. This structure is named as But-1-yn-1ol.
In this structure the presence of four carbon atoms and alcohol group is attached to the first carbon and triple bond attached with the second carbon atom. This structure is named as But-2-yn-1-ol.

Thus the answer is an option (A).

Note:
To find the structure, we must know the IUPAC nomenclature.
-The yne suffix (ending) indicates the presence of an alkyne or cycloalkane group in the molecule.
-The longest chain chosen for the root name must be both carbon atoms of the triple bond.
-The root chain must be numbered from the end nearest a triple bond carbon atom.
-The numbers indicating the carbon atoms of the triple bond are used as the triple bond locator.