Solution: There are three constitutional isomers of the formula C 6H10 that are internal alkynes. Draw them (in the boxes) and name them.

Problem

There are three constitutional isomers of the formula C 6H10 that are internal alkynes. Draw them (in the boxes) and name them.

All Organic Chemistry Practice Problems Drawing Isomers with Functional Groups Practice Problems
Q.Write the structural formula of a compound of molecular formula C 4H8Cl2 in which (a) All the carbons belong to methylene groups 
Q.There are seven isomeric compounds with the formula C 4H10O. Write their structures and classify each compound according to its functional group.
Q.Draw structures for all constitutional isomers with the following molecular formulas:  (b) C2H4Br2 
Q.Propose a pair of constitutional isomers with the molecular formula C6H11F that contain BOTH a ring AND a tertiary alkyl halide. 
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