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Organic Chemistry Flashcards

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

Read the first 7 Organic Chemistry flashcards as text

  1. What type of isomers are (2R,3S)-2,3-dibromobutane and (2S,3R)-2,3-dibromobutane?

    Answer: Enantiomers

    They are non-superimposable mirror images with opposite configurations at every chiral center, making them enantiomers.

  2. Which reaction mechanism describes the addition of HBr to propene in the absence of peroxides?

    Answer: Electrophilic addition (Markovnikov)

    Without peroxides, HBr adds via electrophilic addition following Markovnikov's rule, placing Br on the more substituted carbon.

  3. An amide bond is best described as having which character due to resonance?

    Answer: Partial double bond character (restricted rotation)

    Lone pair donation from nitrogen into the carbonyl gives the C–N bond partial double bond character, restricting rotation.

  4. What is the major product of the dehydration of 2-methyl-2-butanol with H2SO4?

    Answer: 2-methyl-2-butene

    Zaitsev's rule predicts preferential formation of 2-methyl-2-butene, the more substituted (more stable) alkene.

  5. Which spectroscopic technique is most useful for identifying the connectivity of carbon atoms in an organic molecule?

    Answer: 13C NMR spectroscopy

    13C NMR reveals the chemical environment of each distinct carbon, mapping carbon skeleton connectivity.

  6. Which of the following undergoes SN1 reaction most readily?

    Answer: tert-Butyl bromide

    tert-Butyl bromide forms the most stable tertiary carbocation intermediate, making SN1 highly favorable.

  7. The Diels-Alder reaction requires the diene to adopt which conformation?

    Answer: s-cis

    The diene must be in the s-cis conformation so its terminal carbons can overlap simultaneously with the dienophile.