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Chapter 14: Q.21558-14-29P. (page 558)

Esters of chrysanthemic acid are naturally occurring insecticides. How many lines are present in the NMR spectrum of chrysanthemic acid?

Short Answer

Expert verified

The 13C NMR spectrum consists of nine lines.

Step by step solution

01

13C  NMR spectroscopy

The 13C NMR spectroscopy is used to describe the carbon environment of a compound.

The signals in the 13C NMR spectrum give the number of equivalent and non-equivalent carbon atoms which is used to interpret the structure of an unknown compound.

02

Equivalent and non-equivalent carbon atoms

The carbon atoms that have the same chemical environment and that resonate at the same frequency are termed chemically equivalent.

The carbon atoms that have a different chemical environment and that resonate at different frequencies are termed non-equivalent carbon atoms.

03

Number of lines in the 13C NMR spectrum of chrysanthemic acid

Non-equivalent carbon atoms in chrysathemic acid

There are nine non-identical carbon atoms in chrysanthemic acid and hence its 13C NMR spectrum consists of nine signals/lines.

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Most popular questions from this chapter

Question: Rank the highlighted carbon atoms in each compound in order of increasing chemical shift.

a.

b.

Question: Identify the carbon atoms that give rise to the signals in the 13C NMR spectrum of each compound.

a. CH3CH2CH2CH2OH ; 13CNMR: 14, 19, 35, and 62 ppm

b. (CH3)2CHCHO ; 13C NMR: 16, 41, and 205 ppm

c. CH2=CHCHOHCH3 ; 13C NMR: 23, 69, 113, and 143 ppm

Rank the highlighted carbon atoms in each compound in order of increasing chemical shift.

a.

b.

Sketch the NMR spectrum of CH3CH2Cl , giving the approximate location of each NMR signal.

Question. Compound O has a molecular formula C10H12O and shows an IR absorption at 1687 . The 1H -NMR spectrum of O is given below. What is the structure of O?
See all solutions

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