Exam 18: Carboxylic Acids and Their Derivatives Nucleophilic Addition - Elimination at the Acyl Carbon

Which of the following would undergo racemization in base?

The conversion of is accomplished by the use of which oxidizing agent?

A compound,X,C₉H₁₀O,which reacts with I₂/NaOH to give a pale yellow precipitate,gives the following ¹H NMR spectrum. Singlet, $\delta$ 2.38 Singlet, $\delta$ 2.54 Multiplet, (centered) $\delta$ 7.50 Which is a possible structure for X?

Which of the following statements is true of the enamine,