Question

why does so3 act as an electrophile​

Answer 1

why does so3 act as an electrophile ?

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REASON

________

Three highly electronegative oxygen atoms are attached to sulphur atom.

It makes sulphur atom electron-deficient.

Further, due to resonance, sulphur atom acquires positive charge.

Both these factors, make SO3 an electrophile.

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Answer 2

The oxygen atom is more electronegative than sulphur atom and therefore can withdraw electron density towards themselves, creating partial negative charge on itself while partial positive charge is generated on sulphur atom. Hence SO3 becomes electron deficient and hence can act as an electrophile.