2019 A Level H2 Chemistry Paper 1 Question 16 - Determine sp Hybridised Carbon in Organic Compound

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Here's 2019 A Level H2 Chemistry Paper 1 Question 16.

2019 p1 q16 question

We are required to determine which molecule contains 2 sp hybridised carbons.

First let's recap state of hybridisation of carbon.

2019 p1 q16 hybridisation

sp3 hybridised carbon = 4 sigma bonds (4 single bonds)
sp2 hybridised carbon = 3 sigma bonds + 1 pi bond (2 single bonds + 1 double bond)
sp hybridised carbon = 2 sigma bonds + 2 pi bonds (either 2 double bonds or 1 single bond + 1 triple bond)

I have a previous video lesson on hybridisation of carbon in organic compounds so do check it out if you are interested.

So now we know how to deduce the state of hybridisation of carbon, let's run through each of the molecules.

A. Ethyne

2019 p1 q16 ethyne

Both carbons are sp hybridised with 1 single bond + 1 triple bond for each carbon.

B. Ethene

2019 p1 q16 ethene

Both carbons are sp2 hybridised with 2 single bonds + 1 double bond for each carbon.

C. 1,3-Butadiyne

2019 p1 q16 13 butadiyne

All 4 carbons are sp hybridised.

D. 1,3-Butadiene

2019 p1 q16 13 butadiene

All 4 carbons are sp2 hybridised.

Since we want the molecule with 2 sp hybridised carbons, the answer to this question will be option A.

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

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