Determine the expected product of the acid-catalysed reaction between cyclopentanone and methylamine.

Cyclopentanone with an amine group, representing an imine structure.

Cyclopentanone with a nitrogen atom, illustrating an enamine structure.

Cyclopentanone with an oxygen and nitrogen atom, depicting an imine product.

Cyclopentanone with a nitrogen atom, showing an enamine structure.