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We have 3 modes of learning for students to choose from: weekly physical classes at Bishan; weekly online lessons via Zoom; and on-demand video lessons.

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Please be rest assured that I conduct all my classes personally and I do not engage other tutors to teach at my centre.

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Most of my students showed improvements by at least 3 grades and more than 80% have attained distinction for A Levels. The earlier the students join my classes, the more confident I am in improving their grades.

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Usually the class size is around 10 to 12 students. Max class size is 16 pax.

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Yes makeup lesson is available in the same week subject to availability. If makeup class is not possible, the student can view the recorded video lessons at Google Classroom.

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Yes we do. Fees for trial lesson are for Bishan class and for Zoom online class.

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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.

Strong Oxidation of Alkene and Alkylbenzene

Let Chemistry Guru, Singapore's esteemed A Level Chemistry tuition centre, guide you through our discussion question this week!

221121 question

We want to determine the product formed when compound G is oxidised with hot acidified KMnO₄.

Functional groups present are alkene and alkylbenzene.

Let's recap their oxidation first.

1. Strong oxidation of alkenes

221121 strong oxidation of alkene

We have recap this in our video lesson last week.

2. Strong oxidation of alkylbenzene

If carbon directly attached to benzene has minimum 1 hydrogen, it will be oxidised to benzoic acid.

221121 strong oxidation of alkylbenzene

Check out this video lesson for in-depth discussion of strong oxidation of alkylbenzene.

Let Chemistry Guru, Singapore's esteemed A Level Chemistry tuition centre, guide you through compound G and deduce the product.

221121 deduce product

Blue carbon is a methyl group with 3 hydrogens so it will be oxidised to acid group.

Yellow carbon is a quaternary carbon hence it cannot be oxidised.

Green carbon is alkene carbon attached to benzene and hydrogen so will be oxidised to acid group.

Orange carbon is alkyl carbon with 2 hydrogens so it will be oxidised to acid group.

This will result in the breaking of C-C bond between orange and pink carbons.

Finally the pink carbon will be isolated due to oxidation of alkene and oxidation of orange alkyl carbon.

This pink carbon will be oxidised to carbon dioxide and water.

Hence the answer to this question will be option D.

221121 answer

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

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Strong Oxidation of Alkene and Alkylbenzene