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21. Ibuprofen is used as an analgesic for the relief of pain, and also to help reduce fever. What is the hybridization state of carbon indicated by the arrow in the structure of ibuprofen shown below? A) Sp (if any triple bond is on) B) sp2 ( if there is double bond) C) sp3 (if there is only single bonds) D) sp3d E) sp3d2