orgo questions

4. What is the hybridization of the central carbon of allene (1,2-propadiene)? A) sp B) sp2 C) sp3 D) p E) none of the above 5.Rank the following dienes in order of increasing stability: A. trans-1,3-pentadiene, B. cis-1,3-pentadiene, C. 1,4-pentadiene, and D. 1,2-pentadiene 1 (least stable: 2. 3. 4 (most stable): 6. How many molecular orbitals are needed to represent the conjugated pi system of -carotene? A) 1 B) 10 C) 11 D) 20 E) 22 7. Which of the following represents the highest occupied molecular orbital for the conjugated 1 system in Vitamin D3