2019 A Level H2 Chemistry Paper 1 Question 17 - Deduce Smallest Ether with Chiral Carbon

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Let's look at this organic chemistry question, 2019 A Level H2 Chemistry Paper 1 Question 17.

2019 p1 q17 question

We need to deduce the smallest ether possible with a chiral carbon present.

So let's focus and start with the chiral carbon.

A chiral carbon is a saturated sp3 hybridised carbon that is bonded to 4 different groups.

We can use an asterisk to denote a chiral carbon.

So the 4 different groups that we will put around this chiral carbon will be:

1. a hydrogen since it will not contribute to carbon number.
2. a -O-CH3 group to fulfil the ether functional group criteria. Notice the smallest R2 will be a methyl group and there is no need for R2 to be any larger.
3. a methyl group for smallest alkyl group possible.
4. an ethyl group for the next smallest alkyl group possible.

2019 p1 q17 deduce chiral carbon

Hence we have our required structure and there are altogether 5 carbons.

So the answer to this question will be option B.

Topic: Introduction to Organic Chemistry, Organic Chemistry, A Level Chemistry, Singapore

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