brodidit for students
Alcohols and phenols
Class 12 · Chemistry · 8 questions
Name: ____________________ Date: ____________
Oxidation of a primary alcohol with acidified dichromate gives first:
- A An ester
- B An alkane
- C A ketone
- D An aldehyde
Oxidation of a secondary alcohol gives a:
- A Ketone
- B Alkane
- C Carboxylic acid
- D Aldehyde
Phenol is:
- A Strongly basic
- B Strongly acidic
- C Weakly acidic
- D Neutral
Ethanol and ethanoic acid react in the presence of an acid catalyst to form:
- A An ester
- B An ether
- C An aldehyde
- D An alkene
Methanol is poisonous because it is metabolised to:
- A Water only
- B Ethanol
- C Methanal and methanoic acid
- D Glucose
A tertiary alcohol is:
- A Resistant to oxidation by dichromate
- B Easily oxidised to an aldehyde
- C Easily oxidised to a ketone
- D Always a gas
The general formula of a saturated monohydric alcohol is:
- A CnH2n-1OH
- B CnH2n+1OH
- C CnHnOH
- D CnH2nOH
The reaction of phenol with bromine water gives a:
- A Blue solution
- B White precipitate
- C Green solid
- D Red gas
Answer key
1. D, 2. A, 3. C, 4. A, 5. C, 6. A, 7. B, 8. B
Primary alcohols give aldehydes and then carboxylic acids.
Secondary alcohols oxidise to ketones.
Phenol is a weak acid, stronger than alcohols.
This is esterification, giving ethyl ethanoate.
These products damage the optic nerve and other tissues.
There is no hydrogen on the carbon bearing OH.
For example, C2H5OH.
2,4,6 tribromophenol forms.