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Chemical Bonding and Molecular Structure question

2019 · 10 Apr · Shift 1 · Q1
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Chemical Bonding and Molecular Structure question

2019 · 10 Apr · Shift 1 · Q1

JEE MainChemistryChemical Bonding and Molecular StructureMCQ+4 / −1
The oxoacid of sulphur that does not contain bond between sulphur atoms is
  1. A
    H2S2O7H_2S_2O_7H2​S2​O7​
  2. B
    H2S2O3H_2S_2O_3H2​S2​O3​
  3. C
    H2S4O6H_2S_4O_6H2​S4​O6​
  4. D
    H2S2O4H_2S_2O_4H2​S2​O4​
View written solutionFree

Correct answer: A

  1. Identify the structures of the given sulphur oxoacids

We need the oxoacid of sulphur which does not contain an S–S bond.

Let us examine each option.

  1. Option A: H2S2O7H_2S_2O_7H2​S2​O7​

This is pyrosulphuric acid (or disulphuric acid), with structure:

HO−S(=O)2−O−S(=O)2−OHHO-S(=O)_2-O-S(=O)_2-OHHO−S(=O)2​−O−S(=O)2​−OH

Here, the two sulphur atoms are connected through an oxygen bridge:

S−O−SS-O-SS−O−S

So, there is no direct S−SS-SS−S bond.

  1. Option B: H2S2O3H_2S_2O_3H2​S2​O3​

This is thiosulphuric acid. It is derived from sulphuric acid by replacing one oxygen with sulphur. Its structure contains:

HO−S(=O)2−SHHO-S(=O)_2-SHHO−S(=O)2​−SH

So, it has a direct S−SS-SS−S bond.

Hence, Option B contains S−SS-SS−S bond.

  1. Option C: H2S4O6H_2S_4O_6H2​S4​O6​

This is tetrathionic acid. Its structure is:

HO3S−S−S−SO3HHO_3S-S-S-SO_3HHO3​S−S−S−SO3​H

Clearly, there are multiple S−SS-SS−S bonds.

Hence, Option C contains S−SS-SS−S bond.

  1. Option D: H2S2O4H_2S_2O_4H2​S2​O4​

This is dithionous acid. Its structure is:

HO−S(=O)−S(=O)−OHHO-S(=O)-S(=O)-OHHO−S(=O)−S(=O)−OH

So, the two sulphur atoms are directly connected by an S−SS-SS−S bond.

Hence, Option D contains S−SS-SS−S bond.

  1. Conclusion

Among all the given oxoacids, only H2S2O7H_2S_2O_7H2​S2​O7​ does not contain a direct sulphur-sulphur bond.

Therefore, the correct answer is:

A  (H2S2O7)\boxed{A\; (H_2S_2O_7)}A(H2​S2​O7​)​

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