Exam 7: Alkenes and Alkynes I: Properties and Synthesis, Elimination Reactions of Alkyl Halides

What "new",more stable,carbocation(s)may be formed when the following carbocation undergoes spontaneous rearrangement?

Draw the structures of all stereoisomers of 2-chloro-4-methyl-3-hexene,clearly showing all stereochemical details,using appropriate 3-D representations (dash-wedge,etc. )as relevant.

Which mechanistic step in the acid-catalyzed dehydration of 3,3-dimethyl-2-butanol is the rate determining step?

The correct IUPAC name for the following compound is:

Select the structure of 4-ethyl-2,3-dimethyl-2-heptene.

What is the major product for the following reaction?

What is the major product of the reaction of the following reaction?

Which compound would be the major product?

Which would be the major product of the following reaction sequence?

What is the major product for the following reaction sequence?

The IR spectrum of an unknown substance Q,C₉H₁₆,is found to have distinct peaks at 3310 cm^-1 and 2140 cm^-1.Treatment of Q with excess H₂ in presence of Raney Ni affords nearly quantitative yields of 2,3-dimethylheptane.Propose a reasonable structure for Q,based on the above information,briefly explaining your rationale.Also give its IUPAC name.

What is the major product for the following reaction?

A compound,C₆H₁₀,which reacts with 2 mol of hydrogen over a platinum catalyst and which shows an IR absorption band at approximately 3300 cm^-1 could be:

Which product (or products)would be formed in appreciable amount(s)when trans-1-bromo-2-methylcyclohexane undergoes dehydrohalogenation upon treatment with sodium ethoxide in ethanol?

What is the major product for the following reaction sequence?

Which reaction would not result in alkylation of the acetylide anion?

Which of the following methods could be used to synthesize 4,4-dimethyl-2-hexyne?

Which alcohol would be most easily dehydrated?

On hydrogenation,a compound C₉H₁₂ absorbs 2 mol of hydrogen.Which of the following is a possible structure for the compound?

What is the major product for the following reaction?