Question
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The IUPAC name of the following compound is


A.1- chloro- 2,4 – dinitrobenzene
B.2-chloro-1,4 dinitrobenzene
C.1,3- dinitro 2 chlorobenzene
D.4-chloro-1,3 dinitrobenzene

Answer
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Hint:
The international union of pure and applied chemistry (IUPAC) is an international federation of national adhering organizations that represents chemists in individual countries. Its purpose is to address many global issues involving the chemical sciences. Commas are used between numbers and dashes are used between letters and numbers. There are no spaces in the name.

Complete step by step answer:
-The IUPAC name of this compound is 1-chloro 2-4dinitrobenzene
-The substitutes present in this structure are used as prefixes in the nomenclature. So when such a situation arises when both prefixes are to be taken into consideration we go alphabetically.
-According to it, chlorine will be given first preference and then nitro
So,
-1-chloro and then we have nitro at two positions 2 and 4. So , 1-chloro-2,4-dinitrobenzene.

Hence, option A is correct.

Additional information
Other names of this compound are:
-Dinitrochlorobenzene
-Chlorodinitrobenzene
2,4- dinitrophenyl chloride
4- chloro -1,3 –dinitrobenzene

Note:
It is a yellow solid that is soluble in organic solvents. It is an important intermediate for the industrial production of other compounds. The melting and boiling point of this compound are 53˚C and 315˚C respectively. It has an almond-like odor and can be abbreviated in the form CDNB and DNCB.