020200
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Hi,

Can someone explain how to do this question? With this question type, I always find myself spending ages drawing out the possibilities... Is there a shorter and sharper method? I got the wrong answer anyhow

Thanks!
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username3718068
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(Original post by 020200)
Hi,

Can someone explain how to do this question? With this question type, I always find myself spending ages drawing out the possibilities... Is there a shorter and sharper method? I got the wrong answer anyhow

Thanks!
Well firstly, you can tell that the molecule is saturated because the sum of hydrogen and chlorine atoms is 8, and given there are 3 carbons it follows the 2n + 2 rule as in alkanes.

So now all we can do is figure out how many ways we can bond the hydrogens in different C atoms.

We can bond both hydrogens at the same carbon at C1 and C2.

We can place 1 H at C1, and another H on C2 or C3

We can consider the spatial arrangement of Hydrogens in the above examples, but then we would be talking about stereoisomerism and the question talks about structural isomers.
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