PYQSide ExamsMy practice

Alcohols, Phenols and Ethers · Question 51

AIPMT 2002MCQEasy📈 Topic in 0% papers+4−1
1

n-Propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent?

  1. PCl5
  2. reduction
  3. oxidation with potassium dichromate
  4. ozonolysis

Answer

(3) oxidation with potassium dichromate

Solution

n-Propyl alcohol is a 1 alcohol and isopropyl alcohol is a 2 alcohol.

As per NCERT, on oxidation with acidified K2Cr2O7, 1 alcohols give aldehydes (then acids) and 2 alcohols give ketones.

CH3CH2CH2OH K2Cr2O7/H+ CH3CH2CHO CH3CH2COOH

(CH3)2CHOH K2Cr2O7/H+ CH3COCH3

∵ The products (aldehyde/acid vs ketone) are different, the two alcohols are distinguished. PCl5 reacts with both alike, and reduction or ozonolysis does not act on them.

Answer: (3)

AIPMT 2002

Keep practising — Alcohols, Phenols and Ethers

2

When phenol is treated with CHCl3 and NaOH, the product formed is

  1. benzaldehyde
  2. salicylaldehyde
  3. salicylic acid
  4. benzoic acid
AIPMT 2002
3

In preparation of alkene from alcohol using Al2O3 which is the effective factor ?

  1. Porosity of Al2O3
  2. Temperature
  3. Concentration
  4. Surface area of Al2O3
AIPMT 2001
4

Which of the following is correct?

  1. On reduction, any aldehyde gives secondary alcohol.
  2. Reaction of vegetable oil with H2SO4 gives glycerine
  3. Alcoholic iodine with NaOH gives iodoform.
  4. Sucrose on reaction with NaCl gives invert sugar.
AIPMT 2001
5

Which reagent converts propene to 1-propanol ?

  1. H2O, H2SO4
  2. B2H6, H2O2, OH-
  3. Hg(OAc)2, NaBH4/H2O
  4. Aq. KOH
AIPMT 2000

All Alcohols, Phenols and Ethers PYQs →

PDFDownload Alcohols, Phenols and Ethers PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Chemistry chapters
Physical ChemistrySome Basic Concepts of ChemistryStructure of AtomStates of MatterThermodynamicsEquilibriumRedox ReactionsSolid StateSolutionsElectrochemistryChemical KineticsSurface Chemistry
Inorganic ChemistryClassification of Elements and Periodicity in PropertiesChemical Bonding and Molecular StructureHydrogens-Block Elementsp-Block Elements (Group 13 & 14)Environmental ChemistryGeneral Principles of Isolation of Elementsp-Block Elements (Group 15–18)d- and f-Block ElementsCoordination Compounds
Organic ChemistryOrganic Chemistry – Some Basic Principles and TechniquesIsomerismHydrocarbonsHaloalkanes and HaloarenesAlcohols, Phenols and EthersAldehydes, Ketones and Carboxylic AcidsAminesBiomoleculesPolymersChemistry in Everyday LifePrinciples Related to Practical Chemistry