Podcast
Questions and Answers
Which of the following aldehydes is characterized by a pungent odor?
What is the physical state of formaldehyde under standard conditions?
Which compound is immiscible in water?
What is the characteristic odor of benzaldehyde?
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Why was soda lime not applied to formaldehyde?
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What is indicated by a clear yellow solution in the Iodoform Test?
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Which compound emits a crimson red color in the Salicylic Acid Test?
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What is the expected result for Acetaldehyde in the Sod.nitroprusside Test?
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What does a yellow precipitate indicate in the Iodoform Test?
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What observation suggests that sodium carbonate might not be a strong acidic compound?
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Which of the following results indicates a negative test result for Acetaldehyde in the Salicylic Acid Test?
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What is the procedure step for the Iodoform Test after adding I2 solution?
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What indicates a negative result in the 30% NaOH Test?
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Study Notes
Practical Organic Chemistry-I (Aldehydes, Ketones)
- Lab 5, Fall Semester 2024-2025
Laboratory Equipment
- Test tubes, rack
- Filter paper
- Test tube clamps
- Beaker with markings (graduated cylinder)
Chemicals
- Formaldehyde
- [316] Phenyl Acetaldehyde
- Benzaldehyde
- Acetophenone
Aldehydes and Ketones
- Aldehydes have a formyl group at one end of the chain
- Ketones have a carbonyl group within the chain
- Formaldehyde, Acetaldehyde, Benzaldehyde, and Acetophenone are examples
- Aliphatic and Aromatic
Physical Characterization
| Compound | Condition | Color | Odor | Miscibility with Water |
|---|---|---|---|---|
| Formaldehyde | Liquid, mobile | Colorless | Pungent | Miscible |
| Acetaldehyde | Liquid, mobile | Colorless | Disagreeable | Miscible |
| Benzaldehyde | Liquid, mobile | Colorless | Bitter almonds | Immiscible |
| Acetophenone | Liquid, mobile | Colorless | Characteristic | Immiscible |
Chemical Characterization
- Soda Lime: Not applicable to all
- FeCl₃: No characteristic observation
- Na₂CO₃: No effervescence (indicates not a strong acid)
Tests and Observations
-
I- lodoform Test:
- Positive result (Acetaldehyde, Acetophenone): Yellow precipitate (turbidity)
- Negative result (Formaldehyde, Benzaldehyde): Clear yellow solution
-
II- Sod. nitroprusside Test:
- Positive result (Acetaldehyde, Acetophenone): Red color
- Negative result (Formaldehyde, Benzaldehyde): No color change
-
III- Salicylic acid Test:
- Positive result (Formaldehyde): Crimson red color
- Negative result (Acetaldehyde, Acetophenone, Benzaldehyde): No color change
-
IV- 30% NaOH Test:
- Positive result (Acetaldehyde): Yellow resin with bad odor
- Negative result (Formaldehyde, Benzaldehyde, Acetophenone): No significant change
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Description
Test your knowledge on aldehydes and ketones in this quiz based on the Practical Organic Chemistry-I lab session. Focus on the properties, uses, and characteristics of compounds like formaldehyde, benzaldehyde, and acetophenone. Ideal for students in the Fall Semester 2024-2025.
