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25.1 Introducing Benzene

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Total cards: 9•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

Benzene chemical formula

Back (Answer)

C6H6

#2
Front (Question)

Characteristics of benzene

Back (Answer)

Colourless, sweet smelling, highly flammable liquid Classified as a carcinogen

#3
Front (Question)

Where is benzene naturally found?

Back (Answer)

In crude oil, component of petrol

#4
Front (Question)

Structure of benzene molecule

Back (Answer)

Hexagonal ring of 6 carbon atoms Each carbon joined to 2 other carbon atoms and 1 hydrogen atom

#5
Front (Question)

How is benzene classified?

Back (Answer)

As an aromatic hydrocarbon or arene

#6
Front (Question)

Kekulé Model

Back (Answer)

Hexagonal ring of 6 Carbon atoms Joined by alternate single and double bonds

#7
Front (Question)

Evidence to disprove Kekulé’s Model

Back (Answer)

Lack of reactivity of benzene Length of carbon carbon bonds in benzene Hydrogenation enthalpies

#8
Front (Question)

Lack of reactivity of benzene

Back (Answer)

If benzene had C=C bonds, it should decolourise bromine in an electrophilic addition reaction However: Benzene doesn’t undergo electrophilic addition reactions Benzene doesn’t decolourise bromine at room temperature and pressure

#9
Front (Question)

Length of Carbon-Carbon bonds in benzene

Back (Answer)

Using X ray diffraction, bond lengths in a molecule can be measured It was found that all the bonds in benzene were 0.139nm in length This is between the length of a single bond (0.153nm) and a double bond (0.134nm)