When 2-methyl-1-cyclopentanol is dehydrated in the presence of an acid catalyst and heat, the hydroxyl group (-OH) is removed and a double bond is formed between the carbon atoms that were originally bonded to the hydroxyl group. This results in the formation of 2-methyl-1-cyclopentene.

The IUPAC name of this compound is based on the following rules:

The root name is based on the number of carbon atoms in the ring (cyclopent-).

The suffix -ene indicates that the compound contains a double bond.

The number 2- indicates that the methyl group is attached to the second carbon atom of the ring.

The number 1- indicates that the double bond is between the first and second carbon atoms of the ring.

Putting all of this together, the IUPAC name of the product is 2-methyl-1-cyclopentene.