R-HgSO4H + SO3 ‚Äö√Ñ√∂‚àö√ë‚àö√Ü‚Äö√Ñ√∂‚àö√ë‚àö√Ü> RSO3H + HgSO4. Which type of reaction is the following?$

R-HgSO4H + SO3 ‚Äö√Ñ√∂‚àö√ë‚àö√Ü‚Äö√Ñ�

1.	R-HgSO4H + SO3 ‚Äö√Ñ√∂‚àö√ë‚àö√Ü‚Äö√Ñ√∂‚àö√ë‚àö√Ü> RSO3H + HgSO4. Which type of reaction is the following?$
A.	Substitution reaction
B.	Replacement reaction
C.	Addition reaction
D.	None of the mentioned
Answer» C. Addition reaction