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Exam 7: Alkenes and Alkynes

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Question 21

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What alkene would you use to prepare the following alkyl halide?

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Question 22

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Hydride shifts

A) occur to form less highly substituted carbocations.
B) occur by transfer of an H⁺ between adjacent carbon atoms.
C) are observed only in single step reactions.
D) transfer positive charge to a more highly substituted carbon atom.

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Question 23

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Instructions: Provide names for each structure below.Be sure to include the cis,trans or E,Z designations where applicable. Name and designate:

Instructions: Dieldrin,C₁₂H₈Cl₆O,is a pentacyclic (five-ring)compound formerly used as an insecticide.Use this information to answer the following question(s). -Refer to instructions.Calculate the degree of unsaturation for Dieldrin.

Instructions: Assign E or Z configurations to each alkene below. Assign:

Rank each set of substituents using the Cahn-Ingold-Prelog sequence rules by numbering the highest priority substituent 1 and numbering the lowest priority substituent 4.Place the number in the blank below the substituent.

Match each definition to the term it describes. -

A compound with the following molecular formula contains two double bonds.What is the correct subscript for H in the formula? C₁₀H_?ClN₂O

Choose substituents X and Y (listed in order below) for the following compound so as to make a Z isomer.

Rank the carbocations below in order of increasing stability (least stable = 1;most stable = 3).Place the number corresponding to the carbocation's relative stability in the blank below the structure.

Name this compound.

Below are all the chemical structures and intermediates involved in a reaction.On the structures provided,show all electron flow using the arrow formalism for the complete stepwise mechanism.

Which of the following would have the smallest DH ^$\circ$ _hydrog?

Draw structures corresponding to each name below. -Draw: trans-4,4-dimethylpent-2-ene