21. Consider the following: CHj CH2 CH-CHCH2 CH CH CH2 CH2 CH2 CH-CH2 CH3 CH-CHCH2 CH2 CH3 CH2-CHCH2 CH2 CH2 CH3 IV which two structures represent the same compound? a. I and II b. II and III c. I and III d. II and IV e. None of these 22. In which of these cases, does the central atom have a zero forma.l charge? a. HEH CH3 OCH3 C. F FBF d. H CH3 H CH3 CH CH3 CCH CH3 23. Identify the atomic orbitals in the c-c sigma bond in ethyne. a. (2sp2, 2sp2) b. (2sp3, 2sp3) _. (2sp, 2sp) d. (2p, 2p) e. (2sp, 1s)
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