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Chapter 12: Q1P (page 354)

Identify the functional groups in each of the following molecules:

(a) Methionine, an amino acid:

(b)Ibuprofen, a pain reliever:

(c) Capsaicin, the pungent substance in chili peppers:

Short Answer

Expert verified

(a)

(b)

(c)

Step by step solution

01

Functional groups

Certain functional groups are designated differently if other functional groups are also present.If a molecule contains a double bond and no other functional group is present, then it is an alkene, but it is considered a C-C double bond if other functional groups are present.

02

Step 2(a): The functional groups in Methionine

In Methionine, there is a total of three functional groups present- one sulfide (-S) group, one carboxylic acid (-COOH) group, and one amine (-NH2) group.

Methionine

03

Step 3(b): The functional groups in Ibuprofen

In Ibuprofen, there are two functional groups present- one carboxylic acid (-COOH) group and one aromatic ring.

Ibuprofen

04

Step 4(c): The functional groups in Capsaicin

In Capsaicin, there are a total of five functional groups present- one alcohol (-OH) group, one ether (-ROR) group, one amide (-CONH) group, one C-C double bond, and one aromatic ring.

Capsaicin

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Most popular questions from this chapter

Question: By knowing the natural abundances of minor isotopes, it’s possible to

calculate the relative heights of and M+1 peaks. If 13C has a natural

abundance of 1.10%, what are the relative heights of the and

M+1 peaks in the mass spectrum of benzene, C6H6?

Question: The infrared spectrum of the compound with the mass spectrum shown below lacks any significant absorption above 3000cm-1. There is a prominent peak near 1740cm-1and another strong peak near 1200cm-1.Propose a structure consistent with the data.


Draw the structure of an alkene that yields only acetone, (CH3)2C=O, on ozonolysis followed by treatment with Zn.

What functional groups might the following molecules contain?

(a) A compound with a strong absorption at 1710 cm-1

(b) A compound with a strong absorption at 1540 cm-1

(c) A compound with strong absorptions at 1720 cm-1 and 2500 to 3100cm-1

Question: How would you use infrared spectroscopy to distinguish between thefollowing pairs of constitutional isomers?

(a)

(b)

(c)

CH3≡CCH3ANDCH3COCH2C≡CHCH3COCH≡CHCH3ANDCH3COCH2CH=CH2CH3CH2CHOANDH2C=CHOCH3
See all solutions

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