The IUPAC name of the following compound is

Cyclohexanecarbaldehyde

The correct answer is Option (4) → Cyclohexanecarbaldehyde

Based on the rules of IUPAC nomenclature for cyclic aldehydes, the IUPAC name for the compound shown in the image is: Cyclohexanecarbaldehyde.

Nomenclature Rules Applied:

• Parent Ring: The compound consists of a six-carbon saturated ring, which is named cyclohexane.
• Functional Group: The aldehyde group ($-CHO$) is directly attached to the ring. When an aldehyde group is attached to a ring and its carbon atom cannot be included in the main chain numbering, the suffix "-carbaldehyde" is added to the name of the ring.
• Numbering: Since there are no other substituents on the ring, the carbon atom of the ring to which the $-CHO$ group is attached is implicitly carbon-1, and no locant number is required. 

So it is Cyclohexanecarbaldehyde.