2019 A Level H2 Chemistry Paper 1 Question 22 - Oxidation of Alcohols for Compound Q

Here's 2019 A Level H2 Chemistry Paper 1 Question 22.

2019 p1 q22 question

We need to deduce the product formed when compound Q is heated under reflux with an excess of acidified potassium dichromate (VI).

Notice there are only alcohol functional groups in compound Q.

Different types of alcohols are oxidised to different extent when reacting with acidified dichromate, heated under reflux.

Primary alcohols are oxidised to carboxylic acids.

Note that primary alcohols can be oxidised to aldehydes but only with acidified dichromate, heating under reflux with immediate distillation.

Secondary alcohols are oxidised to ketones.

Tertiary alcohols cannot be oxidised.

2019 p1 q22 oxidation of alcohols

Check out my previous video lesson for the detailed discussion of oxidation of different types of alcohols.

So we can now run through the options and figure out our answer!

Option A is wrong as the primary alcohol is not oxidised to aldehyde.

2019 p1 q22 deduce A

Option B is wrong as the secondary alcohol should be oxidised.

2019 p1 q22 deduce B

Option C is the correct answer.

2019 p1 q22 deduce C

Option D is wrong as the tertiary alcohol should not be oxidised.

2019 p1 q22 deduce D

Hence the answer to this question is option C.

Topic: Alcohols, Organic Chemistry, A Level Chemistry, Singapore

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