Question

Do constitutional isomers always possess different functional groups?
1) True
2) False

Answer 1

The statement that constitutional isomers always possess different functional groups is false; they can have the same functional group but differ in the structure or position within the molecule, although functional group isomers have different functional groups.

Step-by-step explanation:

Constitutional isomers do not always possess different functional groups. This statement is false. Constitutional isomers include different types of isomers, like positional isomers and skeletal isomers, which can have the same functional group but differ in the structure or position of the functional group within the molecule.

For example, butan-1-ol and butan-2-ol are both alcohols (same functional group) but differ in the position of the -OH group, making them positional isomers. On the other hand, functional group isomers have different functional groups, such as propanal (an aldehyde) and propanone (a ketone), which are both C3H6O but with different functional groups.

A carbon-carbon multiple bond, like a double or triple bond, is indeed considered a functional group because it significantly affects the chemistry of the compound.