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junior college 1 | H3 Maths
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My answer will be Compound A. However i am not sure if Compound B will be the correct answer instead?
There is an inversion of configuration.
Refer to the energy diagram for the pentavalent transition state
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The ketone attached to C1 is meta-directing (1,3 relative to this carbon)
The alkyl group next to it on C2 is ortho-para directing (2,4 relative to this carbon)
Both directing groups are in sync and don't conflict. So you'll expect the SO3H to be added to be added to C3 or C5.
The steric hindrance just means that addition to C3 will be the minor product and to C5 will be the major product. (In some percentages)
It isn't necessarily all or nothing.
https://www.masterorganicchemistry.com/2018/01/29/ortho-para-and-meta-directors-in-electrophilic-aromatic-substitution/