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AP Intermediate 2nd Year Alcohols, Phenols and Ethers — practice questions

Explore 32 free Alcohols, Phenols and Ethers questions in AP Intermediate 2nd Year Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Alcohols, Phenols and Ethers questions and exercises with answers

Showing questions 1–30 of 32.

Glycerol (propane-1,2,3-triol) is classified as:Read the answer and worked solution →Reduction of a ketone (R₂C=O) with NaBH₄ or LiAlH₄ produces:Read the answer and worked solution →A Grignard reagent R-MgX reacts with **methanal (HCHO)** to produce, after hydrolysis:Read the answer and worked solution →A Grignard reagent R'MgX reacts with a **ketone (R₂C=O)** to produce, after hydrolysis:Read the answer and worked solution →The dehydration of ethanol with concentrated H₂SO₄ at 443 K gives:Read the answer and worked solution →As per your syllabus, hydrogenation of an alkene to an alkane uses dihydrogen with which kind of catalyst?Read the answer and worked solution →As per your syllabus, in ethene the C-C bond consists of which σ/π combination, and the carbons are which hybridisation?Read the answer and worked solution →As per your syllabus, geometrical (cis-trans) isomerism in alkenes arises because of which feature of the double bond?Read the answer and worked solution →As per your syllabus, the dipole moment of cis-but-2-ene (0.33 D) and trans-but-2-ene (≈ 0 D) shows which form is non-polar?Read the answer and worked solution →As per your syllabus, partial reduction of an alkyne to a CIS alkene uses which catalyst?Read the answer and worked solution →As per your syllabus, reduction of an internal alkyne with Na in LIQUID NH₃ gives which kind of alkene?Read the answer and worked solution →As per your syllabus, HBr addition to propene gives mainly which product?Read the answer and worked solution →As per your syllabus, the peroxide (Kharasch) effect on HBr addition to propene gives mainly which product?Read the answer and worked solution →As per your syllabus, the peroxide effect is observed only with which hydrogen halide?Read the answer and worked solution →As per your syllabus, the rate-determining intermediate in HBr + propene addition is which species?Read the answer and worked solution →As per your syllabus, mild oxidation of an alkene with cold dilute KMnO₄ (Baeyer's reagent) gives which product?Read the answer and worked solution →As per your syllabus, reductive ozonolysis of an alkene with O₃ followed by Zn/H₂O gives which class of products?Read the answer and worked solution →As per your syllabus, addition of conc. H₂SO₄ to an alkene followed by water gives mainly which class of compound?Read the answer and worked solution →As per your syllabus, the carbon-carbon triple bond in ethyne (HC≡CH) consists of which σ/π combination?Read the answer and worked solution →As per your syllabus, the C-H bond in ethyne is unusually ACIDIC because of which factor?Read the answer and worked solution →As per your syllabus, calcium carbide (CaC₂) reacts with water to give which gas?Read the answer and worked solution →As per your syllabus, terminal alkynes react with sodium metal to liberate which gas + sodium acetylide?Read the answer and worked solution →As per your syllabus, addition of water to ethyne in dilute H₂SO₄ with HgSO₄ catalyst gives which final product?Read the answer and worked solution →As per your syllabus, addition of water to propyne under HgSO₄/H₂SO₄ gives mainly which product (Markovnikov)?Read the answer and worked solution →As per your syllabus, three molecules of ethyne polymerise over a hot red-hot tube to give which compound?Read the answer and worked solution →As per your syllabus, HBr addition to propyne gives which Markovnikov product?Read the answer and worked solution →As per your syllabus, reduction of an alkyne to a TRANS alkene uses which reagent system?Read the answer and worked solution →As per your syllabus, the general molecular formula of an open-chain alkyne is which?Read the answer and worked solution →As per your syllabus, the THREE criteria for aromaticity (Hückel) are which set?Read the answer and worked solution →As per your syllabus, for benzene the value of n in Hückel's (4n+2) π electron formula is which?Read the answer and worked solution →

Worked practice questions

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

  1. Trihydric alcohol — three -OH groups (on C1, C2, C3)
  2. Dihydric alcohol
  3. Phenol
  4. Monohydric alcohol
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Correct answer: A. Trihydric alcohol — three -OH groups (on C1, C2, C3)

Glycerol = **propane-1,2,3-triol** = CH₂(OH)-CH(OH)-CH₂(OH). **Three -OH groups → trihydric alcohol**. Used in soaps, cosmetics, and as a humectant. Ethylene glycol is dihydric; ethanol is monohydric.

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Reduction of a ketone (R₂C=O) with NaBH₄ or LiAlH₄ produces:

  1. A tertiary alcohol
  2. A primary alcohol
  3. A ketone (no change)
  4. A secondary alcohol (R₂CH-OH)
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Correct answer: D. A secondary alcohol (R₂CH-OH)

**Aldehyde → 1° alcohol**; **ketone → 2° alcohol**. NaBH₄ and LiAlH₄ deliver hydride (H⁻) to the carbonyl carbon. LiAlH₄ is stronger (reduces esters, carboxylic acids too) NaBH₄ is milder (only aldehydes and ketones, not acids/esters).

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A Grignard reagent R-MgX reacts with **methanal (HCHO)** to produce, after hydrolysis:

  1. A secondary alcohol
  2. A ketone
  3. A tertiary alcohol
  4. A primary alcohol (R-CH₂-OH)
Show answer and solution

Correct answer: D. A primary alcohol (R-CH₂-OH)

**HCHO + RMgX → R-CH₂-OMgX → (H₂O) → R-CH₂-OH** (primary alcohol). **General rule:** **HCHO → 1° alcohol; other RCHO → 2° alcohol; ketone → 3° alcohol**. Powerful C-C bond-forming reaction.

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More Chemistry topics

Amines and BiomoleculesThe d- and f-Block Elements & Coordination CompoundsElectrochemistryChemical KineticsHaloalkanes, Alcohols and EthersAldehydes, Ketones and Carboxylic AcidsSolutionsHaloalkanes and Haloarenes