Question

Multiple Choice, T/F Questions 1. Which of the following are TRUE (T) or FALSE (F) regarding Diels-Alder reactions? a) The reaction involves syn addition. _b) The reaction occurs in multiple steps. c) The reaction is a [4+2] A cycloaddition. d) The adduct formed fasted is the exo isomer. e) Electron donating groups activate the diene. f) Electron withdrawing groups activate the dienophile. 2. The compound at the right does not undergo Diels-Alder reaction because: a) ring systems cannot function as the diene component. b) it cannot adopt the s-cis conformation. c) it lacks electron withdrawing groups. d) it lacks electron releasing groups. e) the two double bonds are further apart than in non-cyclic conjugated systems. 3. Which of the following dieneophiles is most reactive in a Diels-Alder reaction? III IV

Answer 1

I a) The reaction nivolues syn addition I b) the reaction occurs in multiple step. {D. A exn occurs } I insnigle steps I of the reaction is [4+2] I cycloaddition E d) The adduct formed tasted is the exo isomer. The major product formed in D-A exn is knietic product and it is endo product } I e) Electron donating group activate the diene. I t) Election anith elrauning groups activate the dienoplrile ③ o this comhround does not undergo D. A reachon © It cannot alopt s-cis conformation. F sucis conformation is most inportant steres chemical aspect for a diene to undergo D. A reaction} ☺ Do yoyo this us most seatine diencophile in a Diel's Alder reaction because it has e-withdrawing group attached to ut. Due to e-withdrawing group the energy of Lumo of dieneophile will deacrease due to which it will be easy to Homo of diene to donate electrons to dienophile.