Question

Write IUPAC name of $C{H_2} = C{H_{}} - Cl$ .

Answer 1

Hint: For naming a compound a must follow every procedure and rules of IUPAC . Given compound has a double bond that means it is an alkene and a halide group chlorine in it . During naming we minimise the position of double bonds and groups attached to the carbon chain .

Complete step by step answer:
Given compound is an alkene so according to IUPAC rules we will select the largest carbon chain which contains double bonds . Also the suffix of the compound is “-ene” for an alkene . If there is more than one double bond in an alkene then we select that longest carbon chain which contains all of these bonds . We write the position of numbers from lowest to highest by separating each number by comma .
If a number of groups is attached in a carbon chain then we select that longest carbon chain then we select that longest carbon chain which contains all the groups , double bonds , triple bonds and give position to the groups according to their priority order .
In the given alkene only one group is attached which is chlorine and it is attached to the right side of the chain so we will start counting from the right side .
$\mathop {C{H_2}}\limits_2 = \mathop {CH}\limits_1 - Cl$
So IUPAC name of compound is : $1$ chloro eth $1$ ene or simply it can also be written as “chloroethene” .

Note:
 A common name for chloroethene used is vinyl chloride and it is generally used for food packing . We should also remember that for naming a compound in which different functional groups are attached we should remember the priority order of functional groups . e.g. Carboxylic acid is the most prior group in the table after that sulphonic acid , ester etc .