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Chapter 17: Q.7. (page 641)

Question: How many C13 NMR signals do each compound exhibit?

a.

b.

c.

Short Answer

Expert verified

Answer

Number ofC13NMR signals

  1. 6 signals
  2. 7 signals
  3. 4 signals

Step by step solution

01

C13 NMR

The C13has an odd number of neutrons and hence exhibits the NMR phenomenon. It is used to understand the backbone of an organic molecule, to identify the number of equivalent carbon and types of carbons.

02

Number of  C13 NMR signal

a. Six types of carbons are present in the structure which are represented as:

Equivalent carbon in structures

Therefore, the compound gives 6 signals.

b. All the carbons in the structure are non-equivalent because of different chemical environment.

Structure with no equivalent carbon

Therefore, the compound gives 7 signals.

c. There are four sets of equivalent carbons which are represented as:

Equivalent carbon in structures

Therefore, the compound gives 4 signals.

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Most popular questions from this chapter

Question: Explain why triphenylene resembles benzene in that it does not undergo addition reactions with Br2, but phenanthrene reacts with Br2to yield the addition product drawn. (Hint: Draw resonance structures for both triphenylene and phenanthrene, and use them to determine how delocalized each 蟺bond is.)

What orbitals are used to form the labeled C-Cbonds in the following molecule? Of the labeled bonds, which is the shortest?

Draw the structure corresponding to each name

  1. isobutyl benzene
  2. o-dichlorobenzene
  3. cis-1,2-diphenylcyclohexane
  4. m-bromoaniline
  5. 4-chloro-1,2-diethylbenzene
  6. 3-tert-butyl-2-ethyltoluene

Question:

a. Draw all reasonable resonance structures for pyrrole and explain why pyrrole is less resonance stabilized than benzene.

b. Draw all reasonable resonance structures for furan and explain why furan is less resonance stabilized than pyrrole.

Question: Compounds A and B are both hydrogenated to methylcyclohexane. Which compound has the larger heat of hydrogenation? Which compound is more stable?
See all solutions

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