3. Acids and Bases

Which of the following best describes the first step in the reaction mechanism between an $\text{acid chloride}$ and an $\text{alcohol}$ to form an $\text{ester}$?

Given the following spectral data: IR shows a strong absorption at $1715cm-1$, the $1^H$ NMR displays a singlet at $2.1$ ppm integrating to $3$ hydrogens, and the molecular formula is $C_3{H}_{6}O$. Which structure is most consistent with this data?

Which of the following bases is most likely to favor an $E_2$ elimination mechanism over an $E_1$ mechanism?

In the context of a reaction mechanism where both kinetic and thermodynamic products are possible, which of the following statements correctly identifies the kinetic product formed during the reaction?

In the following reaction mechanism, compound A reacts with ${\mathrm{Br}}_2$ in CCl$4_{}$ to give compound B, which upon treatment with aqueous NaOH yields compound C. Which of the following correctly identifies compounds A, B, and C?

In the context of organic reaction mechanisms, after which intermediate do the $S{N}_1$ and $E1$ mechanisms diverge?

Which of the following best describes the role of curved arrows in the mechanism of the sulfonation of $\mathrm{benzene}$?

In a typical reaction mechanism, which of the following statements correctly distinguishes between intermediates and transition states?

Which of the following correctly completes the mechanism for the acid-catalyzed keto-enol tautomerization of ${\mathrm{CH}}_3\mathrm{CO}{\mathrm{CH}}_3$ (acetone)?

Which statement best describes the structure that results from the use of a curved arrow in a reaction mechanism?

Which statement best describes the role of curved arrows in illustrating a single-step organic reaction mechanism?

Which of the following statements correctly describes the thermodynamic product formed in the reaction of 1,3-butadiene with $H_{2}O$ in the presence of acid, and the key mechanistic step leading to its formation?

In the context of nucleophilic substitution, which set of curved arrows correctly shows the flow of electrons in the S$N_2$ reaction of ${\mathrm{CH}}_3\mathrm{Br}$ with $\mathrm{OH}-$?

In the context of a reaction mechanism, which model best represents the molecules present at the end of the reaction?

Which of the following best describes the first step in the acid-catalyzed cleavage of an ether with concentrated $H_2\mathrm{SO}{4}_4$?