NMR Organic Chemistry multiple choice

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Why do we only see four peaks in the 1H NMR when we have five CH2 groups and 2 OH groups?
Answer
a. There should be more peaks, but they peaks are overlapping in the spectrum.
b. Heptanedioic acid is a symmetrical molecule.
c. Heptanedioic acid is a chiral molecule.
d. Heptanedioic acid is an unsymmetrical molecule.

molecule is heptanedioic acid also known as pimelic acid.

HNMR
triplet at 2.3 ppm, quintet at 1.55, quintet at 1.25
the hydoxyl hydrogens would be an intense singlet at 9.4 ppm.

  • NMR Organic Chemistry multiple choice -

    I would say C. Heptanedioic acid is a chiral molecule.
    Please let me know if its right.

  • NMR Organic Chemistry multiple choice -

    The answer is b

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