### LOGOLOGY, DERD-EKITI
2ND SEMESTER EXAMINATION FOR 2030/202 ACADEMIC SESSION

DEPARTMENT: Medical Laboratory Technician
COURSE: Organic Chemistry
COURSE CODE: CHE 102
UNIT: 3
TIME ALLOWED: Two Hours
INSTRUCTION: Answer all questions

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#### QUESTION ONE

1. (a) With the aid of structural equations of reaction, explain the addition polymerization of ethene monomers to polyethylene polymers.

(b) Discuss briefly each of the following characteristic features of organic compounds:
- Covalency
- Polarity & Solubility
- Low melting & boiling points
- Thermal instability
- Flammability
- Reactivity

(c) The compound peptide is produced by the interaction between amino groups and carboxylic groups. Explain with detailed structures.

#### QUESTION TWO

2. (a) When [tex] \text{CH}_2\text{CH}_2 [/tex] is mixed with [tex] \text{O}_2 [/tex], it produces a compound called epoxyethane. Discuss.

(b) Define the following terms:
- Isomer
- Geometric isomers
- Polymerization

(c) With detailed equations of reactions, explain how trichloromethane and tetrachloromethane are formed.

#### QUESTION THREE

3. (a) [tex] \text{CH}_3\text{CH}_2\text{OH} [/tex] (Ethanol) and [tex] \text{CH}_3\text{O}\text{CH}_3 [/tex] (Methoxymethane) are isomers. Discuss the chemical characteristics of these two isomers.

(b) With the aid of a detailed diagram, explain the lock and key hypothesis of enzyme-controlled reactions.

(c) Write out the detailed structural formulae for:
- Starch
- Sucrose
- Glucose
- Fructose

#### QUESTION FOUR

4. (a) What do you understand by hydrogen bond?

(a.ii) The boiling point of n-pentane is 36°C while the boiling point of butan-1-ol is 118°C. Both compounds have similar relative molecular mass. Explain the reason for the difference in boiling points.

(b) Discuss the breakdown of starch molecules into ethanol and carbon(IV) oxide in cassava.

(b.ii) Explain what you understand by esterification reaction and illustrate it with an example.