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CPC Organic Chemistry & Synthesis Flashcards

6 cards from real CPC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 CPC Organic Chemistry & Synthesis flashcards as text

  1. Which reaction mechanism involves the simultaneous breaking and forming of bonds in a single concerted step?

    Answer: SN2

    SN2 (bimolecular nucleophilic substitution) proceeds via a concerted mechanism with simultaneous bond breaking and formation in one transition state.

  2. In a Diels-Alder reaction, the diene must be in which conformation for the reaction to proceed?

    Answer: s-cis

    The diene must adopt the s-cis conformation so that both double bonds can overlap simultaneously with the dienophile's π system.

  3. Which reagent is most commonly used to reduce an aldehyde to a primary alcohol?

    Answer: NaBH4 or LiAlH4

    Both NaBH4 and LiAlH4 can reduce aldehydes to primary alcohols, with NaBH4 being milder and LiAlH4 being more powerful.

  4. What is the product of ozonolysis of a terminal alkene followed by reductive workup (Me2S)?

    Answer: Aldehyde and formaldehyde

    Reductive workup of a terminal alkene ozonolysis yields an aldehyde from the internal carbon and formaldehyde from the terminal CH2.

  5. Which of the following best describes a Grignard reagent acting as a nucleophile?

    Answer: Carbon-metal bond donating electrons to an electrophile

    Grignard reagents (RMgX) act as nucleophiles because the polarized C–Mg bond makes the carbon electron-rich, allowing it to donate electrons to electrophiles.

  6. Which protecting group is selectively removed under acidic conditions to reveal an alcohol?

    Answer: THP (tetrahydropyranyl)

    THP ethers are acid-labile and are selectively cleaved by dilute acid to reveal the free alcohol.