A Level Chemistry 2017 Paper 1 Question 18 Solution - Exclusive

In this exclusive video we want to discuss the suggested solution for A Levels Chemistry (H2 Chemistry) 2017 Paper 1 Question 18.

Let's take a look at this question:

2017 A Level H2 Chemistry Paper 1 Q18 question

The topic tested in this question is on Alkenes, in particular the electrophilic addition of HBr.

1. Determine number of products which are tertiary bromoalkanes

Since we are adding an asymmetrical reagent HBr to an asymmetrical alkene, we will have 2 different products for each alkene depending on which carbon the bromine is attached to.

Since we have 2 of such alkenes in the compound, the total number of possible products will be 4.

2017 A Level H2 Chemistry Paper 1 Q18 determine tertiary bromoalkane

From the products drawn we can determine we have 3 products with tertiary bromoalkanes.

2. Determine molecular formula of product

All the products will have the same molecular formula so we just need to use any of the product to figure out the molecular formula.

2017 A Level H2 Chemistry Paper 1 Q18 determine molecular formula

From this product drawn we can count that there are 26 hydrogen so the molecular formula is C15H26Br2.

We can finally combine both deductions and conclude that the answer to this question is D.

2017 A Level H2 Chemistry Paper 1 Q18 compare answer

Check out this video for the full solution and detailed explanation!

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

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