Which of the following conditions will most likely promote an $E2$ reaction with an alkyl halide?

Draw the elimination products for each of the following E2 reactions; if the products can exist as stereoisomers, indicate which stereoisomers are obtained.

e. 3-chloro-3-ethyl-2,2-dimethylpentane + high concentration of CH₃CH₂O^-

cis-1-Bromo-4-tert-butylcyclohexane and trans-1-bromo-4-tert-butylcyclohexane both react with sodium ethoxide in ethanol to form 4-tert-butylcyclohexene. Explain why the cis isomer reacts much more rapidly than the trans isomer.

Draw the structure of DDE.

Which of the following is the least reactive substrate in an $E_2$ reaction?

Which of the following alkyl chlorides will afford only a single alkene product ($A$) exclusively under $E2$ reaction conditions?

What is the major organic product formed when $C_2{H}_5{\mathrm{Br}}_1$ (ethyl bromide) reacts with a strong base such as $O_2{H}_1-$ (ethoxide ion) in an E2 elimination reaction?

Which of the following reagents will favor an $E_2$ reaction with all substrates?

Which of the following is the major E2 product formed from the elimination of ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{Br}}_1$ (1-bromopropane) with a strong base?