Question

Write the IUPAC name of $C{H_3} - C{H_2} - C{H_2} - CH = C{H_2}$.

Answer 1

Hint: When two pairs of electrons are shared by the atom to form a chemical bond, the resulting bond will be a double bond. The hydrocarbon comprising a double bond between the two groups is termed as alkenes.

Complete step by step answer:
The full form of IUPAC is the International Union of pure and applied chemistry. The system has set some rules for naming the chemical compounds.
The given compound is shown below.

STEP 1: Identify the group
In the given hydrocarbon, a double bond is present in the first position of the parent chain due to which the suffix will be –ene.
STEP 2: Find the longest carbon chain

The hydrocarbon consists of five carbon atoms in the longest chain or parent chain. Therefore, the hydrocarbon is named as pentane.
STEP 3: Number the carbon atoms present in the longest chain
The numbering of the carbon atom starts from the double bond as it is the highest priority group.
STEP 4: Combine the entire element into a single IUPAC name
The IUPAC name of the compound is pent-1-ene.

Additional information: The aliphatic hydrocarbon is divided into straight-chain and branched-chain. Both of them have the same general formula ${C_n}{H_{2n + 2}}$. In a straight chain, the carbon atom is bonded with two hydrogen atoms from both the side and in branched-chain, removal of one hydrogen from the $ - C{H_2}$ group takes place which is replaced by an alkyl group.


Note:
In the IUPAC name, the number represents the position of the group or any other functional group and it is written before the suffix. Alkenes are also termed as olefins.