10th class Chemistry, Chapter 23: Monohydroxy Alkanes or Alcohols MCQs

1. Which conditions are considered best for the fermentation of glucose?

1. (A) 35 °C, fresh yeast, absence of oxygen ✓
2. (B) 45 °C, yeast
3. (C) 45 °C, absence of oxygen
4. (D) 35 °C, fresh yeast

2. Which catalyst other than H₃PO₄ can also be used for hydration of alkenes?

1. (A) NaOH
2. (B) H₂SO₄ ✓
3. (C) CH₃COOH
4. (D) Ni

3. Alcohol which has the maximum heat of combustion is:

1. (A) CH₃CH₂CH₂OH
2. (B) CH₃CH₂OH
3. (C) CH₃OH
4. (D) CH₃CH₂CH₂CH₂OH ✓

4. The most environment friendly fuel is:

1. (A) coal
2. (B) kerosene oil
3. (C) ethanol ✓
4. (D) wood

5. Which property or properties of ethanol make it suitable to be used in cosmetic industry?

1. (A) Easily Flammable
2. (B) Highly volatile and deodorizing ✓
3. (C) Antipyretic
4. (D) Sedative

6. Which is the correct name of the alcohol CH₃-CH(OH)-CH₂-CH(CH₃)-CH₃?

1. (A) 2-Methylpentan-4-ol
2. (B) 4-Methylpentan-2-ol ✓
3. (C) Hexan-2-ol
4. (D) Hexan-4-ol

7. Which property of ethanol makes it suitable for cleaning wounds?

1. (A) Good solvent
2. (B) Volatility
3. (C) Antiseptic ✓
4. (D) Deodorizing

8. Which alcohol is added in petrol to improve combustion and serves as a feed stock to prepare vinegar and many other organic compounds?

1. (A) Propanol
2. (B) Propan-2-ol
3. (C) Ethanol ✓
4. (D) Methanol

9. Fermentation is a reaction in which a substance breaks down into simpler substances in the presence of:

1. (A) light
2. (B) enzymes ✓
3. (C) acids only
4. (D) metals

10. Which of the following is an example of fermentation?

1. (A) Melting of ice
2. (B) Rusting of iron
3. (C) Preparation of yogurt, bread and ethyl alcohol ✓
4. (D) Burning of wood

11. The fermentation of glucose is carried out at around:

1. (A) 15 °C
2. (B) 25 °C
3. (C) 35 °C ✓
4. (D) 100 °C

12. Fermentation to obtain ethanol must be done in the:

1. (A) presence of chlorine
2. (B) presence of air
3. (C) absence of air (anaerobic conditions) ✓
4. (D) presence of light only

13. The gas given off during fermentation of glucose is:

1. (A) methane
2. (B) oxygen
3. (C) hydrogen
4. (D) carbon dioxide ✓

14. Fermentation of glucose gives ethanol and:

1. (A) 2CO₂ ✓
2. (B) 3CO₂
3. (C) H₂O only
4. (D) 2H₂

15. Yeast is made inactive when the ethanol concentration exceeds:

1. (A) 5%
2. (B) 10%
3. (C) 15% ✓
4. (D) 50%

16. A lower temperature during fermentation:

1. (A) increases the rate
2. (B) stops oxygen
3. (C) makes ethanol pure
4. (D) decreases the rate of the reaction ✓

17. Hydration of ethene is a(n) ____ reaction.

1. (A) substitution
2. (B) elimination
3. (C) addition ✓
4. (D) neutralization

18. In the hydration of ethene the catalyst used is:

1. (A) vanadium oxide
2. (B) platinum
3. (C) hot phosphoric acid ✓
4. (D) nickel

19. Hydration of ethene is done at ____ and 60 atm pressure.

1. (A) 35 °C
2. (B) 100 °C
3. (C) 300 °C ✓
4. (D) 600 °C

20. The starting material for the hydration of ethene is obtained from:

1. (A) crude oil ✓
2. (B) sugar cane
3. (C) yeast
4. (D) grapes