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- Which diene will react the slowest with ethylene? The correct answer is B, however I think C is the most stable so please explain!!Arrange the following according to INCREASING reactivity towards E2: 1st ( least reactive)? 2nd? 3rd? 4th (most reactive)?Which diene in each pair has the larger heat of hydrogenation?
- Illsutrate the Energy diagram for carbocation formation in two different SN1 reactions ?(a) Why cyclohexene and cyclohexa-1,3-diene are expected to undergo addition reaction but benzene does not? Explain clearly. (b) Why is an electron-donating group to benzene activating and usually a/an ortho/para director?Determine reagents C and D from the reaction scheme below.
- Why does the diene need to be in the s-cis conformation to yield the cyclic product?What is the product E and how is it formed? Can this be explained using frontier molecular orbital analysis? What would the regiochemistry and stereochemistry be?Which of the following are correct? Correct any false statements. a. A conjugated diene with an even number of double bonds undergoes conrotatory ring closure under thermal conditions. b. A conjugated diene with an antisymmetric HOMO undergoes conrotatory ring closure under thermal conditions. c. A conjugated diene with an odd number of double bonds has a symmetric HOMO.