1. In a Diels-Alder reaction, electron-withdrawing groups in thedienophile end up preferentially in
the _________ position, and the diene must be in the____________ conformation.
A) Endo; s-cis C) Exo; s-trans
B) Endo; s-trans D) Exo; s-cis
2.What is the hybridization of the central carbon of allene(1,2-propadiene)? A) sp B) sp2 C) sp3 D) p
3.Which of the following corresponds to the COC bond angle indiethyl ether? A) 60o B) 110o C) 120o D) 180o
4.Which of the following terms best describes the reactivenature of an organolithium reagent?
A) Carbocation B) free radical C) electrophile D) nucleophile E)carbene
