Question

Allyl Chloride is an important chemical used in the manufacture of plastics, pharmaceuticals and pesticides. Give the systematic name of allyl chloride.

Answer 1

To solve such a question we use the preference order for numbering of the compound. The alkene group has more preference than haloalkanes. While naming the compound, chlorine will be named first and then the other part.

Complete step by step answer:
To obtain the systematic name or IUPAC name of a given compound, first we have to give numbering to the carbons. The numbering of the carbons will be according to the preference order of the functional group attached to it.
The preference order of alkenes is higher than haloalkanes (Alkene > Haloalkane). So, we will start numbering from the carbon which is attached to the double bond that is alkene. Also, we have to choose the longest carbon chain so we will start numbering from the first starting carbon of the alkene group. The numbering can be shown as:

Now to name the given compound, there are three carbons so word root is prop, also there is alkene group at carbon $1$ so ene suffix will come at end and the prefix will be chloro which is at carbon number $3$.
So, the IUPAC name of given compound is:
$3 -$Chloro-prop$- 1 -$ene.

Additional information: The allyl chloride has chemical formula ${C_3}{H_5}Cl$. It is a colourless liquid and is insoluble in water but it is soluble in common organic solvents. It is highly flammable liquid. They are mainly used to manufacture a compound called epichlorohydrin. Epichlorohydrin is used to produce epoxy resins, surfactants and many other products.

Note:
In the allyl chloride compound, carbon$- 3$ is called as allylic carbon because it is attached to a carbon atom which in turn is doubly bonded to another carbon atom. This is why this compound is called allyl chloride.