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Chemistry Guru specialises in H2 Chemistry for JC1 and JC2 or IP Year 5 and IP Year 6 students only. Find out all the information about A Level H2 Chemistry and the detailed comparison between H1 and H2 Chemistry. We do not conduct lessons for H1 Chemistry, O Level Chemistry, IB Chemistry or IP Chemistry at IP Year 3 and IP Year 4.

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

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

Back to list of questions for 2019 A Level H2 Chemistry Paper 1

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