Question

IUPAC name of the compound below is?

A) Cyclohexanal
B) Cyclohexane Carbaldehyde
C) Cyclohexanecarbaldehyde
D) None of these

Answer 1

IUPAC naming follows a few sets of rules. The number of carbons determines the parent chain. The suffix –al is used for aldehydes.

Complete step by step solution:
Keeping in mind the points of nomenclature, as the cyclic compound contains six carbon atoms in a cyclic chain, hence the base chain will be cyclohexane. Now coming to the functional group attached to it, the aldehyde group. Normally any straight chain organic compound is named in the pattern “alkan-al”. Now this is because the carbonyl carbon is a part of the main carbon chain, but as here, the carbonyl group is detached from the main carbon chain, we have to include the same in the final nomenclature.

Hence, the name of the compound is “Cyclohexane Carbaldehyde.”

Note:
The compound in question is a cyclic compound and hence there are a set of rule that are to be abided by to name the compound:

1. First and foremost, the parent alkyl chain needs to be determined. The parent chai is the one with the highest number of carbon atoms. If there are two cycloalkane groups, the one with the higher number of carbon atoms is chosen is the parent chain.
2. If there is a straight chain that has a greater number of carbon atoms than the cyclohexane, then the alkyl group will be taken as the main chain while the cyclic group will serve as the substituent.
3. The substituents are named in alphabetical order
4. The functional groups present in the compound are mentioned as per their priority and the most priority group is placed at the end of the name.