Question

Which of the following represents chloroprene, the monomer of neoprene?
A.$C{H_2} = CH - CH = C{H_2}Cl$
B.
C.
D.

Answer 1

To solve this question, one needs to understand the name chloroprene i.e. we need to know its chemical IUPAC name, then we can easily identify the structure. Since, as name suggests chloroprene, the structure must contain the chlorine molecule.

Complete answer:
Let’s start with basic properties of neoprene. Neoprene is the type of synthetic rubber which is made up of many units of monomer chloroprene.
Several units of monomer molecules of chloroprene join together to form the durable and chemically stable synthetic rubber.
Neoprene is stable and flexible over a wide range of temperatures.
Now, coming to the properties of chloroprene. So, chloroprene is the colourless and the volatile liquid.
Let’s understand the chemical name of chloroprene so we can easily identify the structure of the molecule using its chemical name.
Therefore, the chemical name of chloroprene is $2 -$chlorobuta $- 1,3 -$diene.
And the chemical formula of chloroprene is ${C_4}{H_5}Cl$ .
So, from our above discussion, the answer is easy to find out as now we can identify the structure of chloroprene and that is:
$C{H_2} = CH - CH = C{H_2}Cl$
So, this is the correct structure of chloroprene.
Hence, the correct answer is option A.

Note:
In the chloroprene molecule – we have four carbon atoms i.e. bute and the chloro group or chlorine atom is attached directly to the methyl group which is in turn is attached to the carbon atom through double bonds. Chloroprene molecule is also found somewhat toxic in nature as inhaling the vapours of chloroprene for a long time results in liver malfunctioning.