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Assam CEE Alcohols — practice questions

Explore 8 free Alcohols questions in Assam CEE Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Alcohols questions and exercises with answers

Showing questions 1–8 of 8.

**Glycerol** (propane-1,2,3-triol) is classified as:Read the answer and worked solution →**Phenol** differs from an alcohol because:Read the answer and worked solution →Alcohols have **higher boiling points** than ethers of similar molecular weight because:Read the answer and worked solution →**Phenol is more acidic than ethanol** because:Read the answer and worked solution →**Order of acidity** of phenol, water, ethanol:Read the answer and worked solution →**Dehydration** of alcohols to alkenes with concentrated H₂SO₄ follows the order:Read the answer and worked solution →Order of **dehydration rate** of alcohols R-CH₂-OH, R₂-CHOH, R₃-COH (R = CH₃) with conc. H₂SO₄ is:Read the answer and worked solution →Judge each alcohol claim and reasonRead the answer and worked solution →

Worked practice questions

**Glycerol** (propane-1,2,3-triol) is classified as:

  1. Monohydric alcohol
  2. Dihydric alcohol
  3. Trihydric alcohol (three –OH groups)
  4. Phenol
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Correct answer: C. Trihydric alcohol (three –OH groups)

**Glycerol:** CH₂(OH)-CH(OH)-CH₂(OH) — three hydroxyl groups ⇒ trihydric alcohol. Used in soap, cosmetics, food (humectant), explosives (nitroglycerine).

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**Phenol** differs from an alcohol because:

  1. Phenol's OH is bonded to an sp² carbon of an aromatic ring
  2. Phenol's OH is bonded to an sp³ carbon
  3. Phenol has no OH group
  4. Both phenol and alcohol have OH on aromatic rings
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Correct answer: A. Phenol's OH is bonded to an sp² carbon of an aromatic ring

**Phenols:** -OH bonded directly to an aromatic-ring carbon (sp²). **Alcohols:** -OH on aliphatic sp³ carbon. **Crucial difference:** phenol's lone pair conjugates with ring ⇒ acidic; alcohol is essentially neutral.

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Alcohols have **higher boiling points** than ethers of similar molecular weight because:

  1. Alcohols form intermolecular hydrogen bonds (O–H···O)
  2. Alcohols are less polar
  3. Ethers are gases
  4. Ethers can't dissolve
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Correct answer: A. Alcohols form intermolecular hydrogen bonds (O–H···O)

Alcohols H-bond strongly through OH groups. Ethers (R-O-R) lack OH, only weak dipole-dipole/dispersion forces. **Example:** ethanol (b.p. 78 °C) vs dimethyl ether (b.p. −24 °C) — both C₂H₆O!

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