Question

Draw the structure of the following ${{H}_{2}}{{S}_{2}}{{O}_{7}}$ .

Answer 1

Hint: ${{H}_{2}}{{S}_{2}}{{O}_{7}}$ is also known as oleum. Oleum is also known as disulfuric acid and the IUPAC name of oleum is sulfo hydrogen sulphate. We can solve this problem by keeping in mind the IUPAC rules for nomenclature for the organic compound. For the IUPAC naming of compounds there are certain rules to be followed. The IUPAC nomenclature is a step wise rule to name the compound.

Complete Solution:
The structure of ${{H}_{2}}{{S}_{2}}{{O}_{7}}$ or oleum is mentioned below:

The number of sulphur-sulphur bonds present in oleum is zero. There are a total of 4 double bonds which are present in the structure. We can see that there are 4 oxygen atoms present which are linked to sulphur by a double bond and the rest of them are joined together using the single bond.

Additional information-
IUPAC stands for international union for pure and applied chemistry ach the steps to write the IUPAC nomenclature are mentioned below:
Step-1 select the longest carbon chain
Step-2 identifies the substituents attached to the parent chain and number the parent chain from the end which gives the lowest number to the substituent.
While writing the IUPAC nomenclature the substituents present in the given compound should be arranged in alphabetical order and if the same substituent occurs more than one then the prefix like di, tri, tetra etc. are used. It is important to put a comma between two numbers and a dash between a number and the name of the substituent. While arranging the substituents in alphabetical order we should ignore the prefix like di, tri, and tetra and arrange on the basis of the first letter of the substituent name.

Note: Oleum is used as a petroleum refining agent and over exposure to oleum can cause severe eyes irritation which can further lead to swollen eyes.