Correct option is D
In chemical nomenclature, the IUPAC nomenclature of organic chemistry is a method of naming organic chemical compounds as recommended by the International Union of Pure and Applied Chemistry (IUPAC).
The steps for naming an organic compound are:
Identification of the most senior group. If more than one functional group, if any, is present, the one with highest group precedence should be used.
Identification of the ring or chain with the maximum number of senior groups.
Identification of the ring or chain with the most senior elements (In order: N, P, Si, B, O, S, C).
Identification of the parent compound. Rings are senior to chains if composed of the same elements.
For chains: Identification of the parent hydrocarbon chain. This chain must obey the following rules, in order of precedence:
It should have the maximum length.
Identification of the side-chains. Side chains are the carbon chains that are not in the parent chain, but are branched off from it.
Identification of double/triple bonds.
In the given compound, Cl has higher atomic number than oxygen. CH3 group has higher priority than H atom. CH3 and side chain containing Cl are on the same side of the double bond. Therefore, the alkene is Z.
