Question

What is the name of this molecule?

Answer 1

According to IUPAC Nomenclature in the naming of a hydrocarbon having 2 cyclic rings, always prefer the larger cyclic ring and then start numbering the ring from the side from the next carbon having any functional group or alkyl group existing outside the ring.

Complete answer:

Naming the above given carbon according to IUPAC Nomenclature of the above given hydrocarbon.
As we know in the cyclic rings if there are two rings then the rings having greater number of carbons is to be named the parent ring and the other ring the daughter ring.
In the parent ring start the nomenclature having something attached to it other the hydrogen and the carbon of its fellow parent ring, which could be any of the first or second carbon named as above.
Now the carbon that should be named second should be the carbon having something attached to it other than the hydrogen or other carbon from the fellow parent cyclic ring. That is named second in the above figure.
The other carbons of the parent carbon other than the first and second have no outside group attached to it except hydrogen.
The carbon outside the parent ring is a carbon chain of three carbons

Naming the carbon according to the same IUPAC Nomenclature therefore carbon having 2 chlorides be given the first number and the other two similar carbons having same and low polarity second and third.
Therefore, this hydrocarbon ring be named as $1,1 - dichloro\,cyclopropyl$
And the name of the parent ring therefore would be $1,2 - (1,1 - dichloro\,cyclopropyl)\,cyclopentane$
The name of the cyclic hydrocarbon given above is $1,2 - (1,1 - dichloro\,cyclopropyl)\,cyclopentane$.

Note:
In the naming of hydrocarbons the priority is always given to the carbon containing a functional group having the highest polarity in the whole chain or cycle.