Chapter 11: Alcohols Phenols Ethers

NCERT Solutions for CBSE Class 10 Chemistry — 12 solved questions with detailed explanations.

Questions

Topics

Solved Questions

Q1. Lucas test distinguishes between primary, secondary, and tertiary alcohols using:

Conc. H₂SO₄
ZnCl₂/conc. HCl
Na metal
K₂Cr₂O₇

Difficulty: Easy-Medium · Topic: Tests

Solution

Lucas reagent = ZnCl₂/conc. HCl. 3° alcohol reacts instantly (turbidity), 2° in 5 min, 1° very slowly.

Q2. Phenol is more acidic than ethanol because:

Phenyl group is electron-withdrawing
Phenoxide ion is stabilized by resonance
O-H bond is weaker in phenol
Phenol has higher molecular weight

Difficulty: Easy-Medium · Topic: Acidity

Solution

Phenoxide ion (C₆H₅O⁻) is stabilized by delocalization of negative charge into the aromatic ring.

Q3. Williamson synthesis is used to prepare:

Alcohols
Ethers
Aldehydes
Ketones

Difficulty: Easy-Medium · Topic: Ether Synthesis

Solution

Williamson synthesis: R-O⁻ + R'-X → R-O-R' + X⁻. Used to prepare ethers.

Q4. Dehydration of alcohol gives:

alkene
aldehyde
ether at low temp
alkane

Difficulty: Easy-Medium · Topic: Alcohols Phenols Ethers

Solution

alkene.

Q5. Kolbe's reaction produces:

phenol from benzene
ether from alcohol
aldehyde from alcohol
salicylic acid from phenol

Difficulty: Easy-Medium · Topic: Alcohols Phenols Ethers

Solution

salicylic acid from phenol.

Q6. Reimer-Tiemann reaction on phenol gives:

benzaldehyde
catechol
salicylic acid
salicylaldehyde

Difficulty: Easy-Medium · Topic: Alcohols Phenols Ethers

Solution

salicylaldehyde.

Q7. Reimer-Tiemann involves:

Grignard
Kolbe
Williamson
Phenol + CHCl₃/OH⁻ → salicylaldehyde

Difficulty: Easy-Medium · Topic: Named Reactions

Solution

Reimer-Tiemann: Phenol + CHCl₃/OH⁻ → salicylaldehyde.

Q8. Williamson synthesis involves:

Grignard
Kolbe
R-O⁻ + R'-X → R-O-R' (ether)
Wurtz

Difficulty: Easy-Medium · Topic: Named Reactions

Solution

Williamson synthesis: R-O⁻ + R'-X → R-O-R' + X⁻. Used to prepare ethers.

Q9. IUPAC name of CH₃OH:

Propanol
Methanol
Ethanol
Butanol

Difficulty: Easy-Medium · Topic: IUPAC

Solution

CH₃OH = Methanol.

Q10. IUPAC name of CH₃CH₂OH:

Butanol
Ethanol
Methanol
Propanol

Difficulty: Easy-Medium · Topic: IUPAC

Solution

CH₃CH₂OH = Ethanol.

Q11. IUPAC name of CH₃COCH₃:

Ethanone
Butanone
Propanone (Acetone)
Propanal

Difficulty: Easy-Medium · Topic: IUPAC

Solution

CH₃COCH₃ = Propanone (Acetone).

Q12. IUPAC name of CH₃CH₂CH₂OH:

Butanol
Propan-1-ol
Ethanol
Propan-2-ol

Difficulty: Easy-Medium · Topic: IUPAC

Solution

CH₃CH₂CH₂OH = Propan-1-ol.

Other Chapters in Chemistry

Ch 1: Solid State Ch 2: Solutions Ch 3: Electrochemistry Ch 4: Chemical Kinetics Ch 5: Surface Chemistry Ch 6: Isolation of Elements Ch 7: p-Block Elements Ch 8: d & f Block Elements Ch 9: Coordination Compounds Ch 10: Haloalkanes & Haloarenes Ch 12: Aldehydes Ketones Ch 13: Amines Ch 14: Biomolecules Ch 15: Polymers Ch 16: Chemistry in Everyday Life

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