3. Acids and Bases

Which of the following best describes the first step in the curved arrow pushing mechanism for a Michael (conjugate) addition reaction between ${\mathrm{CH}}_2\mathrm{COCH}3$ (acetone) and ${\mathrm{CH}}_2\mathrm{CHCO}{2}_{\mathrm{Et}}$ (ethyl acrylate) under basic conditions?

Which of the following best describes the mechanism of the reaction between ${\mathrm{CH}}_3\mathrm{Br}$ and $\mathrm{OH}-$ in aqueous solution?

Which atoms in the enol ether would you expect to react with Br⁺ ?

Which of the following best describes the term 'reaction mechanism' in organic chemistry?

Which of the following best describes the correct curved arrow notation for a hydride shift in a carbocation rearrangement during an organic reaction mechanism?

Which of the following is the major organic product formed in the reaction of ${\mathrm{CH}}_3\mathrm{CH}=\mathrm{CH}2$ (propene) with $\mathrm{HBr}$ under standard conditions (no peroxides)?

Which of the following best completes the electron-pushing mechanism for the decarboxylation of $R_{\mathrm{COOH}}$ (a carboxylic acid) to form $RH$ and $\mathrm{CO}{2}_{}$ under heating conditions?

Which of the following correctly represents the two major products formed in the reaction of $2_{\mathrm{-bromobutane}}$ with ${\mathrm{Na}}_{\mathrm{OEt}}$ in $\mathrm{EtOH}$?

Which of the following substrates is most likely to undergo an $S_{\mathrm{N}}1$ substitution mechanism under typical conditions?

Which of the following best describes the structure of the tetrahedral intermediate initially formed during the nucleophilic addition of a ${\mathrm{HO}}^{-}$ ion to an aldehyde?

The following reaction steps are shown using conventional electron pushing. (b) Use the bouncing arrow formalism to illustrate the formation of only the product shown.

(c)

Which of the following best describes the most likely sequence of steps in the mechanism of an S$N_1$ reaction?

Which of the following best describes the stepwise mechanism for the acid-catalyzed hydration of $C_2{H}_4$ (ethylene) to form ethanol?

Which of the following best describes the purpose of adding curved arrows to the reactants in an organic reaction mechanism?

Given the reaction of ${\mathrm{CH}}_3\mathrm{CH}=\mathrm{CH}2$ (propene) with $\mathrm{HBr}$ in the presence of peroxides, predict the major organic product and identify the correct mechanism.