Textbook: Solomons 10th Ed. (2009)

Chapter 7: Alkenes and Alkynes I

Practice Problems (No matching mendel sets were found.)

Individual Problems

Problem # 333

Let's go over how a carbocation can form from an alcohol.

Write in the curved arrows to show the formation of the protonated alcohol, and water acting as a leaving group to form a carbocation.

Problem # 335

Carbocations aren't very stable and so don't last very long after they are formed.

Use curved arrows to show:

a) how a carbocation reacts with a halide ions to form an alkyl halide.

b) how a carbocation reacts with water to form an alcohol.

c) how a carbocation reacts with a base to form an alkene.

Problem # 348

For the reaction below, draw the structures of the carbocation intermediate and the final product.

Problem # 518

The alcohol below is protonated and contains an oxygen with a positive charge. Using curved arrows, show the two "legal moves" that result in a neutral oxygen.

Problem # 519

Let's work through an elimination reaction. Draw the structures for each of the species in the three boxes below (protonated thiol, carbocation, and alkene). Also draw curved arrows to show electron movement. 

Problem # 307

Rank the group of molecules below in in order of decreasing basicity. (1 = most basic)

Explain your reasoning.

Problem # 561

Fill in the product for each reaction below. Indicate stereochemistry where appropriate.

Problem # 529

Indicate the major organic product of the reaction below. Include stereochemistry.

Problem # 530


Let's work through anti and syn additions to alkenes.
Show the product for each reaction below, and indicate whether the product will be a racemic mixture of enantiomers, or a meso compound (which is achiral).

Problem # 319

For a molecule to undergo an E2 reaction, the leaving group and the beta-proton must be in an anti-coplanar conformation (one atom straight up, the other straight down). Based on this, which compound undergoes E2 reaction with KOtBu faster? Why?


Problem # 341

 Predict the product(s) of the reaction below, and used curved arrows to show a mechanism.

Problem # 531


E2 elimination reactions require anti-coplanar geometry. (note: some textbooks call this anti-periplanar).
Let's work through an E2 reaction, and rotate the molecule eblow into an anti-coplanar geometry to predict the product of this E2 reaction.