A reaction in which an alkene is formed is (a) 1...

A reaction in which an alkene is formed is (a) 1 -bromo-1-methylcyclohexane is treated with $\mathrm{NaOH}$ in the presence of acetone. (b) 1 -bromo- 1 -methylcyclohexane is treated with $\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3} \mathrm{~N}$. (c) Chlorocyclohexane is heated with $\left(\mathrm{CH}_{3}\right)_{3}$ CONa in t-butanol (d) 1 -bromo-1-phenylbutane is treated with aqueous $\mathrm{NaOH}$

A reaction in which an alkene is formed is
(a) 1 -bromo-1-methylcyclohexane is treated with $\mathrm{NaOH}$ in the presence of acetone.
(b) 1 -bromo- 1 -methylcyclohexane is treated with $\left(\mathrm{C}_{2} \mathrm{H}_{5}\right)_{3} \mathrm{~N}$.
(c) Chlorocyclohexane is heated with $\left(\mathrm{CH}_{3}\right)_{3}$ CONa in t-butanol
(d) 1 -bromo-1-phenylbutane is treated with aqueous $\mathrm{NaOH}$

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Key Concepts

Elimination Reactions

Elimination reactions involve the removal of atoms or groups from a molecule, resulting in the formation of a double bond, typically an alkene. They are characterized by the loss of a proton and a leaving group, and are a central class of organic reactions used to form unsaturated compounds.

Reaction Conditions and Solvent Effects

The outcome of a reaction, particularly in elimination versus substitution, is heavily influenced by the reaction conditions including the strength of the base, the nature of the solvent, and the temperature. Aprotic solvents and strong bases tend to favor elimination (alkene formation), while protic solvents and weaker bases may shift the reaction balance towards substitution.

E2 Mechanism

The E2 mechanism is a bimolecular elimination process where a strong base removes a ?-hydrogen from the substrate at the same time as the leaving group departs in a single, concerted step. This reaction typically requires an anti-periplanar geometry between the hydrogen being abstracted and the leaving group, and is favored under conditions of strong bases and high temperatures.

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