Monochlorinated products of Methyl Cyclobutane
Cyclobutane is a small cyclic hydrocarbon that is not able to undergo free rotation due to its four-membered ring structure. As a result, it cannot show geometrical isomerism (GI).

Chlorination of Methyl Cyclobutane
When methyl cyclobutane undergoes chlorination, the reaction typically occurs at the most substituted carbon due to the stability of the resulting carbocation. In this case, the chlorine atom will most likely substitute the methyl group.

Possible Monochlorinated Products
- **1-Chloromethylcyclobutane**: This product is obtained when the chlorine atom substitutes the methyl group on the cyclobutane ring. The chlorine atom is attached to the primary carbon of the ring.
- **2-Chloromethylcyclobutane**: This product is formed when the chlorine atom substitutes the methyl group on the cyclobutane ring. The chlorine atom is attached to the secondary carbon of the ring.
- **3-Chloromethylcyclobutane**: This product is obtained when the chlorine atom substitutes the methyl group on the cyclobutane ring. The chlorine atom is attached to the tertiary carbon of the ring.
These monochlorinated products can further undergo chlorination reactions to form additional chlorinated products. The overall reaction mechanism involves the formation of a carbocation intermediate, followed by the attack of the chlorine atom.
In conclusion, although cyclobutane itself cannot exhibit geometrical isomerism, the chlorination of methyl cyclobutane can lead to the formation of multiple monochlorinated products with different positional isomerism.