Question 1:

The functional group of the alcohol family is the hydroxyl group, represented as –OH.

From the options given:

• A. C–H — This is a carbon-hydrogen single bond, found in alkanes, not specific to alcohols.

• B. O–H — This is the hydroxyl group, characteristic of alcohols.

• C. C=C — This is a carbon-carbon double bond, found in alkenes.

• D. COOH — This is the carboxyl group, characteristic of carboxylic acids.

Correct answer: B. O–H ✅

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 2:

The correct answer is A. fermentation.

Fermentation is the biological process in which sugars like glucose are converted into ethanol and carbon dioxide by the action of enzymes from yeast or bacteria.

• B. denaturing refers to the structural alteration of proteins, not sugar-to-ethanol conversion.

• C. distillation is a physical separation process, not a chemical conversion of sugar to ethanol.

• D. hydration generally refers to adding water to a molecule, such as in converting alkenes to alcohols.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 3:

The correct answer is C. yeast, 30°C.

• Fermentation of sugars to ethanol requires yeast (or other microorganisms) as the biological catalyst, and the process occurs best at mild temperatures (around 25–35°C).

• 30°C is suitable for yeast activity, while 300°C would kill the yeast and stop fermentation.

• Phosphoric acid is used in the industrial hydration of ethene to make ethanol (not from sugar), at high temperatures and pressures, not for fermentation of glucose.

So, C matches both the correct substance (yeast) and the correct temperature (30°C).

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 4:

The correct answer is D. C₆H₁₂O₆ → 2 C₂H₅OH + 2 CO₂.

This is the balanced chemical equation for alcoholic fermentation.
Glucose (C₆H₁₂O₆) is broken down into ethanol (C₂H₅OH) and carbon dioxide (CO₂).

Checking the atom balance:

• Left side: 6 C, 12 H, 6 O

• Right side (2 C₂H₅OH + 2 CO₂):
  C: 2×2 + 2×1 = 4 + 2 = 6
  H: 2×6 = 12
  O: 2×1 + 2×2 = 2 + 4 = 6 ✅

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 5:

The correct answer is B. fractional distillation.

Here's why:

• A. distillation — Simple distillation could separate ethanol from water, but because ethanol and water form an azeotrope (95.6% ethanol maximum by simple distillation), fractional distillation is more efficient and gives a more concentrated solution initially.

• B. fractional distillation — This is the correct method used in industry to obtain a concentrated ethanol solution from the fermentation mixture, as it allows better separation due to the close boiling points of ethanol (78.4°C) and water (100°C).

• C. filtration — This removes solid particles (e.g., yeast cells), but does not concentrate ethanol.

• D. evaporation — Evaporation would remove water and possibly some ethanol, but would not yield a concentrated ethanol solution efficiently.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 6:

The correct answer is D. C₂H₄ + H₂O → C₂H₅OH.

This is the industrial hydration of ethene (C₂H₄) to produce ethanol.
The reaction adds water across the double bond of ethene, requiring an acid catalyst (e.g., phosphoric acid) and high temperature/pressure.

Checking each option:

• A — Uses ethane (C₂H₆, an alkane), not ethene; incorrect.

• B — Also uses ethane and produces methane and methanol; incorrect.

• C — Uses ethene but produces C₂H₄O (likely acetaldehyde) + H₂; incorrect.

• D — Correct reactants and product, balanced as written.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 7:

The correct answer is B. carbon dioxide and water.

Complete combustion of any hydrocarbon or alcohol (in sufficient oxygen) produces only carbon dioxide (CO₂) and water (H₂O).

The balanced equation for the complete combustion of ethanol (C₂H₅OH) is:

C₂H₅OH + 3 O₂ → 2 CO₂ + 3 H₂O

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 8:

Based on the chemical structures provided in the image, the correct answer is C.

Analysis:

Alcohol X: Contains one carbon atom (CH₃OH), which is methanol.

Alcohol Y: Contains three carbon atoms (C₃H₇OH), which is propanol.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 9:

The correct answer is C. ethanoic acid.

When ethanol (C₂H₅OH) is treated with an oxidizing agent (e.g., acidified potassium dichromate or potassium permanganate), it is first oxidized to ethanal (acetaldehyde) and then further oxidized to ethanoic acid (acetic acid, CH₃COOH).

In summary:

• Mild oxidation → ethanal

• Stronger oxidation → ethanoic acid

Options:

• A & B are products of combustion, not mild oxidation.

• D (ethene) is from dehydration of ethanol with concentrated sulfuric acid, not oxidation.

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.

Question 10:

Oxidation

(Since the alcohol is changed into a carboxylic acid, which means oxygen has been added.)

*These A.I. responses have been individually checked to ensure they match the accepted answer, but explanations may still be incorrect. Responses may give guidance but the A.I. might not be able to answer the question! This is particularly the case for questions based on diagrams, which the A.I. typically cannot interpret.
Grade Gorilla uses Gemini, Deepseek and a range of other A.I. chatbots to generate the saved responses. Some answers have had human intervention for clarity or where the A.I. has not been able to answer the question.