For # 15-18, consider the structure of this carboxylic acid 5 bo -OH 4 3 15. What is the hybridization of C;? B. spa A. SP C. sp3 D. sp4 16. What are the overlapping orbitals involved in the C2 - C3 bond? A. sp2 sp2 B. sp2 sp3 C. sp3 sp3 D. sp sp2 17. What is the approximate value of the bond angle formed by O, C1 and 0 (0)? A. 90 B. 109.5 C. 120 D. 180 18. The C3 = C4 bond is made up of A. 1 bond and 1 o bond B. 1 T bond and 2 o bond C. 2 t bond and 1 o bond D. 2 T bonds only