3.34 Identify the functional groups in each molecule. Classify each alcohol, alkyl halide, amide, and amine as 1°, 2°, or 3°. a. С. НО е. ibuprofen (analgesic) но penicillin G (an antibiotic) Darvon (analgesic) H2N. b. d. HO, OH pregabalin trade name Lyrica (used in treating chronic pain) pyrethrin I (potent insecticide from chrysanthemums) histrionicotoxin (poison secreted by a South Amorican frog)

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**Exercise 3.34: Understanding Functional Groups in Molecules**

The task is to identify the functional groups present in each of the given molecules. Additionally, each alcohol, alkyl halide, amide, and amine needs to be classified as primary (1°), secondary (2°), or tertiary (3°).

### Molecule Descriptions:

**a. Darvon (Analgesic)**
- *Structure*: Contains an aromatic benzene ring fused with a cyclohexane ring, alongside an ester group, and a tertiary amine (N).

**b. Pregabalin (Trade Name: Lyrica)**
- *Use*: Used in treating chronic pain.
- *Structure*: Comprises an amino group (primary amine, NH₂) and a carboxylic acid group (OH attached to the carbonyl).

**c. Ibuprofen (Analgesic)**
- *Structure*: Consists of an aromatic benzene ring with an isobutyl group, along with a carboxylic acid group (OH attached to the carbonyl).

**d. Histrionicotoxin**
- *Use*: Poison secreted by a South American frog.
- *Structure*: Features a cyclohexenyl ring, multiple alkene (double bond) groups, a tertiary amine (N), and an alcohol group (OH).

**e. Penicillin G (Antibiotic)**
- *Structure*: Includes a beta-lactam ring (cyclic amide), an amide, a thioether (S), and a carboxylic acid group (HO).

**f. Pyrethrin I**
- *Use*: Potent insecticide from chrysanthemums.
- *Structure*: Comprises a cyclopropane ring, esters, an alkene group, and a ketone.

Understanding and identifying these functional groups provide insight into the chemical behavior and reactivity of these compounds in biological and synthetic contexts.
Transcribed Image Text:**Exercise 3.34: Understanding Functional Groups in Molecules** The task is to identify the functional groups present in each of the given molecules. Additionally, each alcohol, alkyl halide, amide, and amine needs to be classified as primary (1°), secondary (2°), or tertiary (3°). ### Molecule Descriptions: **a. Darvon (Analgesic)** - *Structure*: Contains an aromatic benzene ring fused with a cyclohexane ring, alongside an ester group, and a tertiary amine (N). **b. Pregabalin (Trade Name: Lyrica)** - *Use*: Used in treating chronic pain. - *Structure*: Comprises an amino group (primary amine, NH₂) and a carboxylic acid group (OH attached to the carbonyl). **c. Ibuprofen (Analgesic)** - *Structure*: Consists of an aromatic benzene ring with an isobutyl group, along with a carboxylic acid group (OH attached to the carbonyl). **d. Histrionicotoxin** - *Use*: Poison secreted by a South American frog. - *Structure*: Features a cyclohexenyl ring, multiple alkene (double bond) groups, a tertiary amine (N), and an alcohol group (OH). **e. Penicillin G (Antibiotic)** - *Structure*: Includes a beta-lactam ring (cyclic amide), an amide, a thioether (S), and a carboxylic acid group (HO). **f. Pyrethrin I** - *Use*: Potent insecticide from chrysanthemums. - *Structure*: Comprises a cyclopropane ring, esters, an alkene group, and a ketone. Understanding and identifying these functional groups provide insight into the chemical behavior and reactivity of these compounds in biological and synthetic contexts.
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