2019 A Level H2 Chemistry Paper 1 Question 23 - Deduce Structure of Amide in Compound Y

Let's take a look at 2019 A Level H2 Chemistry Paper 1 Question 23.

2019 p1 q23 qn

We need to deduce the structure of compound Y based on the following info:

Carboxylic acid W which is chiral can be converted to X which then reacts with a cycloamine to form amide Y.

Since W is chiral, Y should be chiral as well, which means Y contains a saturated carbon bonded to 4 different groups.

Also, since the structure of the cycloamine is given, the amide in Y should contain the same cycloamine structure.

2019 p1 q23 chiral C and cycloamine in Y

Now we can go through the options to choose our best answer.

Option A is our best answer since a chiral carbon (marked with an asterisk) and the cycloamine are both present.

2019 p1 q23 option A

Option B is wrong since there is no chiral carbon.

2019 p1 q23 option B

Option C is wrong since the amine is not a cycloamine as the nitrogen is not part of the cyclostructure.

2019 p1 q23 option C

Option D is wrong since there is no chiral carbon and the amine is not a cycloamine.

2019 p1 q23 option D

Hence the answer to this question will be option A.

Topic: Nitrogen Compounds and Proteins, Organic Chemistry, A Level Chemistry, Singapore

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