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JEE Advanced Alcohols, Phenols and Ethers — practice questions

Explore 27 free Alcohols, Phenols and Ethers questions in JEE Advanced 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 1–27 of 27.

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 →As per your syllabus, all six C-C bond lengths in benzene are equal to approximately which value?Read the answer and worked solution →As per your syllabus, the carbon atoms of benzene are which hybridisation?Read the answer and worked solution →

Worked practice questions

As per your syllabus, hydrogenation of an alkene to an alkane uses dihydrogen with which kind of catalyst?

  1. Sodium in liquid NH₃
  2. Anhydrous AlCl₃
  3. Finely divided Pt/Pd/Ni
  4. Lindlar's catalyst
Show answer and solution

Correct answer: C. Finely divided Pt/Pd/Ni

Your syllabus: Pt/Pd catalyse at room T Ni needs higher T+P. Lindlar (partial poisoning) gives cis-alkene from alkyne.

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As per your syllabus, in ethene the C-C bond consists of which σ/π combination, and the carbons are which hybridisation?

  1. 1 σ + 1 π; sp²
  2. 1 σ + 2 π; sp
  3. 3 σ; sp³
  4. 2 σ; sp³
Show answer and solution

Correct answer: A. 1 σ + 1 π; sp²

Your syllabus: C=C is 1 σ (sp²-sp²) + 1 π (parallel p overlap). Carbons are sp² hybridised, trigonal planar.

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As per your syllabus, geometrical (cis-trans) isomerism in alkenes arises because of which feature of the double bond?

  1. Hybridisation change
  2. Carbocation stability
  3. Free rotation
  4. Restricted rotation
Show answer and solution

Correct answer: D. Restricted rotation

Your syllabus: π bond requires parallel p-orbital overlap rotation would break it, so the substituents on each carbon are locked.

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