Question

Name the following alkene using systematic names.

Answer 1

Concepts and reason

The organic compounds are named according to the IUPAC naming rules. The International Union of Pure and Applied Chemistry is abbreviated as IUPAC. It consists of a prefix, root word, and suffix.

Fundamentals

IUPAC nomenclature:

In the naming rules of IUPAC, the name of an organic compound contains:

• Root word: It presents the longest carbon chain present in the parent compound. The root word given is meth, eth, and prop based on the number of carbon atoms.

• Prefix: Prefix is added before the root word. It is given to the other substituents or side chains present in the longest chain.

• Suffix: It is given at the end of the name based on the type of functional group present.

For example, ane is given at the end if the compound is alkane, ene is given if the compound is alkene or yne is given if the compound is alkyne.

Thus, the way of naming an organic compound is

For naming alkenes:

(a) Find the longest continuous carbon chain present in the parent compound, which includes the carbon atoms of the double bond.

(b) Find out the substituent or side chain present in the long chain and name them accordingly.

(c) Number the longest carbon chain, such that the double bond gets the least number.

(d) When more than one double bond is present, the numbering is done in a manner such that all the double bonds enter the numbering and gets the lowest possible number.

(e) When there are two, three, and so on, the double bonds would be present, and then the suffixes are diene, tri-ene, and so on, respectively and the ‘a’ in the root name is retained. Also, the position of the alkenes is written in between the root name and the suffix in numerals separated by a coma.

(f) If substituent alkyl chains are present, the substituents are arranged in the alphabetical order.

(g) Do not consider the numerical prefixes of the substituents while arranging in the alphabetical order.

(h) Write the complete name in the pattern of prefix+root word+suffix.

The given compound is as follows:

The name of the given compound is .

The given compound is as follows:

The name of the given compound is .

The given compound is as follows:

The name of the given compound is .

Ans:

The given compound is as follows:

The given compound is as follows:

The given compound is as follows: