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Explain the formation of two layers in the Lucas test.

Suggest the chemical test to differentiate 1-propanol and 2-propanol. Include chemical equations and observations to support your suggestion.

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(Individual) All 4 students must submit their discussion separately.  Write your name as the subject 

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(Individual) All 4 students must submit their discussion separately.  Write your name as the subject 

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Record a 30s video saying what you have learned or gained from this experiment.

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Compare and contrast the 3 classes of alcohol- include drawings, specific examples 

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Compare and contrast the 3 classes of alcohol- include drawings, specific examples 

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Nazirf Nur Airell Bin Anuar

MS2417121145

Idlan Aqiff Bin Zuraimi

MS2417120617

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Explain the formation of two layers in the Lucas test.

Suggest the chemical test to differentiate 1-propanol and 2-methyl-2-propanol. Include chemical equations and observations to support your suggestion.

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Formation of Two Layers in the Lucas Test

The Lucas test is used to classify alcohols based on their reactivity with Lucas reagent (a mixture of concentrated HCl and ZnCl₂). The test distinguishes between primary, secondary, and tertiary alcohols based on their ability to form alkyl chlorides, which are insoluble in water.

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Explain the formation of two layers in the Lucas test.

Suggest the chemical test to differentiate 1-pentanol and 2-methyl-2-propanol. Include chemical equations and observations to support your suggestion.

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(Group) List ONE problem encountered for this experiment 

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(Group) List ONE problem encountered for this experiment 

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(Group) Identify two precautions to improve the reliability of the experiment al results 

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(Group) Identify two precautions to improve the reliability of the experiment al results 

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You are required to fill in the blanks and make correct equation..

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Research: Use the internet to find about 1 of the following.

Write 100–150 words summarizing your research or create a simple infographic. ( CHOOSE ONE)

1. Alcohols in Daily Life

Examples:

Find three common products in daily life that contain alcohols (e.g., ethanol in hand sanitizers or methanol in fuels).

Identify the type of alcohol present in these products and explain its purpose.

2. Beneficial Reactions of Alcohols

Examples:

Research one industrial process or reaction involving alcohols that benefits society (e.g., ethanol as a biofuel, glycerol in cosmetics).

Explain how the reaction works and why it is significant in daily life.

3. Sustainability and Green Chemistry

Examples:

Investigate how alcohols are used in sustainable or eco-friendly products.

Identify one green chemistry innovation involving alcohols (e.g., renewable ethanol production from biomass).

4. Medicinal and Health Applications

Examples:

Explore the role of alcohols in medicines (e.g., isopropanol as an antiseptic, ethanol in tinctures).

Research the pros and cons of using alcohols in these contexts.

5. Functional Group Transformations

Examples:

Find a real-world application of alcohol oxidation or reduction reactions.

Explain how the product of these reactions (e.g., aldehydes or ketones) is used in practical applications.

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Alcohols, such as isopropanol and ethanol, play significant roles in medicinal and health applications, mainly for their antiseptic properties and as solvents. Here's an exploration of their uses, benefits, and potential drawbacks:

Isopropanol (Isopropyl Alcohol)

Uses:

Antiseptic: Isopropanol is commonly used as a disinfectant and antiseptic for cleaning and sterilizing surfaces, instruments, and skin before injections or minor surgical procedures. It is also effective at killing a wide range of bacteria, viruses, and fungi.

Topical application: Often used for cleaning wounds and sanitizing hands when soap and water are unavailable.

Pros:

Rapid evaporation: Isopropanol evaporates quickly, leaving no residue and reducing the risk of irritation when used on the skin.

Effectiveness:

It effectively kills germs, making it a common choice for hand sanitizers and medical disinfectants.

Availability:

Isopropanol is widely available and inexpensive, making it a popular choice in healthcare settings.

Cons:

Skin irritation: Prolonged or repeated exposure can lead to dryness, irritation, or cracking of the skin.

Toxicity: While effective as a disinfectant, isopropanol is toxic if ingested, inhaled, or absorbed in large quantities.

Limited use on open wounds: It can damage tissue if used excessively on open wounds, delaying healing.

Ethanol (Ethyl Alcohol)

Uses:

Solvent in tinctures: Ethanol is used as a solvent in medicinal tinctures, where it dissolves active ingredients (like herbs or pharmaceuticals) for easier administration.

Disinfectant: Ethanol is also used in hand sanitizers, medical wipes, and disinfectant solutions to kill pathogens.

Antiseptic: Similar to isopropanol, ethanol is used in some antiseptic applications for cleaning wounds or skin.

Pros:

Antimicrobial properties: Ethanol effectively kills bacteria, viruses, and fungi, making it a go-to for sanitizing purposes.

Widely accepted in medicine: Ethanol is commonly used in pharmaceutical formulations due to its ability to dissolve both water-soluble and fat-soluble compounds.

Less skin irritation than isopropanol: Ethanol is less harsh on the skin when used in moderate amounts, though excessive exposure still leads to drying.

Cons:

Toxicity: Like isopropanol, ethanol is toxic if ingested or absorbed in large amounts, although the body metabolizes it differently.

Flammability: Ethanol is highly flammable, presenting safety concerns in storage and handling, especially in medical settings.

Not as effective at killing some pathogens: While effective, ethanol may not be as potent as other disinfectants like bleach or hydrogen peroxide in killing certain bacteria (e.g., some forms of Clostridium difficile).

General Pros and Cons of Alcohols in Medicinal Use

Pros:

Accessibility: Alcohols are readily available and relatively inexpensive, making them a practical choice for a variety of health applications.

Efficacy: Alcohols, especially ethanol and isopropanol, are highly effective in killing many pathogens, ensuring hygiene and safety in medical environments.

Versatility: Alcohols are used in a wide range of formulations, from antiseptics to solvents, and can be found in numerous over-the-counter products.

Cons:

Skin damage: Both ethanol and isopropanol can cause drying and irritation, especially with frequent or prolonged use.

Toxicity concerns: Ingesting or improperly using alcohol-based products can lead to poisoning, especially in children or those with substance use disorders.

Environmental and safety risks: Both alcohols are flammable, requiring careful storage and handling. Inhalation of alcohol vapors in confined spaces can be hazardous.

Conclusion

Alcohols like isopropanol and ethanol have vital roles in health and medicine due to their antiseptic properties and versatility. While they provide significant benefits in terms of infection control and therapeutic applications, their drawbacks—such as skin irritation, toxicity, and flammability—require careful consideration in their use.

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A) Lucas Test

Tertiary alcohol reacts the fastest with Lucas reagent as it is able to form a tertiary carbocation that is highly stable.

Primary alcohol does not give any results with Lucas reagent because primary carbocation is the least stable.

During the reaction of tertiary alcohol with Lucas reagent, the formation of two layers immediately is due to the insolubility of haloalkane formed in aqueous solution.

Alcohol X is a tertiary alcohol because it reacts immediately with Lucas reagent.

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B) Oxidation

1-butanol is a primary alcohol that is oxidized to carboxylic acid and further to Na₂Cr₂O₇. Orange colour of sodium dichromate turns green due to the reduction of Cr⁶⁺ to Cr³⁺.

2-butanol is a secondary alcohol that is oxidized to ketone and cannot be further oxidised.

2-methyl-2-propanol is a tertiary alcohol that does not undergo oxidation because there is no hydrogen atom on the carbon atom attached to the OH group.

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C) Confirmatory test for phenol

Phenol forms white precipitate when 2,4,6-tribromophenol reacted with bromine water.

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A) Lucas Test

Tertiary alcohol reacts the fastest with Lucas reagent as it is able to form a tertiarycarbocation that is highly stable.Primary alcohol does not give any results with Lucas reagent because primary carbocation is the least stable.

During the reaction of tertiary alcohol with Lucas reagent, the formation of two layers immediately is due to the insolubility of haloalkane formed in aqueous solution.

Alcohol X is a tertiary alcohol because it reacts immediately with Lucas reagent.

B) Oxidation

1-butanol is a primary alcohol that is oxidized to carboxylic acid and further to Na₂Cr₂O₇. Orange colour of sodium dichromate turns green due to the reduction of Cr⁶⁺ to Cr³⁺.

2-butanol is a secondary alcohol that is oxidized to ketone and cannot be further oxidised.

2-methyl-2-propanol is a tertiary alcohol that does not undergo oxidation because there is no hydrogen atom on the carbon atom attached to the OH group.

C) Confirmatory test for phenol

Phenol forms white precipitate, 2,4,6-tribromophenol when  reacted with bromine water.

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MUHAMMAD ISKANDAR BIN MOHD ASRI

MS2417121247

ADAM ZAFIR BIN ROZMAM

MS2417120822

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A) Lucas Test

Tertiary alcohol reacts the fastest with Lucas reagent as it is able to form a tertiarycarbocation that is highly stable.Primary alcohol does not give any results with Lucas reagent because primary carbocation is the least stable.

During the reaction of tertiary alcohol with Lucas reagent, the formation of two layers immediately is due to the insolubility of haloalkane formed in aqueous solution.

Alcohol X is a tertiary alcohol because it reacts immediately with Lucas reagent.

B) Oxidation

1-butanol is a primary alcohol that is oxidized to carboxylic acid and further to Na₂Cr₂O₇. Orange colour of sodium dichromate turns green due to the reduction of Cr⁶⁺ to Cr³⁺.

2-butanol is a secondary alcohol that is oxidized to ketone and cannot be further oxidised.

2-methyl-2-propanol is a tertiary alcohol that does not undergo oxidation because there is no hydrogen atom on the carbon atom attached to the OH group.

C) Confirmatory test for phenol

Phenol forms white precipitate, 2,4,6-tribromophenol when  reacted with bromine water.

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Explain the formation of two layers in the Lucas test.

Suggest the chemical test to differentiate 1-butanol and cyclobutanol. Include chemical equations and observations to support your suggestion.

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In the Lucas test, two layers form because the reaction produces an alkyl chloride, which is nonpolar and insoluble in water. The mixture separates into two phases: the organic layer (containing the alkyl chloride) and the aqueous layer (containing water and unreacted HCl). This immiscibility creates the two distinct layers.