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OCR mod. 4 Organic Chemistry > Alkenes > Flashcards

Alkenes Flashcards

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1
Q

What are alkenes?
general formula?

A

Unsaturated hydrocarbons (molecules made up of only hydrogen and carbon with at least one C=C double covalent bond).

general formula: CnH2n

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2
Q

What do you need to remember about unsaturated molecules?

A

They can make bonds with extra atoms in addition reactions.

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3
Q

Name and draw the displayed fomula for the following alkenes:

CH2CHCH3

CH2CHCHCH2

C5H8

A
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4
Q

What do you need to remember about cyclic alkenes?

A

A cyclic alkene has two fewer H’s than an open-chain alkene.

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5
Q

What is a double bond made up of?

A

a sigma bond and a pi bond.

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6
Q

Describe a sigma bond

A
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7
Q

Describe a pi bond

A
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8
Q

Why are alkanes so unreactive?

A
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9
Q

Why are alkenes more reactive than alkanes?

A
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10
Q

Why is it handy alkenes are so reactive?

A
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11
Q
A
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12
Q

What do you need to remember about double bonds?

A

Double bonds can’t rotate.

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13
Q

How does the double bond in an alkene affect its shape?

A
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14
Q

Why can’t double bonds rotate?

A
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15
Q

What do you need to remeber about the shape of larger alkenes?

A
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16
Q

What is a stereoisomer?

A

Molecules with the same molecular formula but a different arrangement in space.

17
Q

What causes alkenes to form stereoisomers?

A
18
Q

What causes alkenes to form stereoisomers?

A
19
Q

Why do stereoisomers form?

A

stereoisomers occur when the two double-bonded carbon atoms each have two different atoms or groups attached to them.

20
Q

What causes alkenes to form stereoisomers?

A
21
Q

What are the two types of isomer formed from stereoisomerism?

A

an ‘E-isomer’ and a ‘Z isomer’ (hence the name E/Z isomerism).

22
Q

What is characteristic of an ‘E isomer’/ a @Z isomer’?

Describe using the example but-2-ene.

A
23
Q

What do you need to remember when naming stereoisomers?

A

you need to put an ‘E’ or ‘Z’ at the start of the name.

24
Q

What is an easy wy to remeber the difference between an ‘E’ and a ‘Z’ isomer?

A

In the ‘Z’ isomer, the groups are on ‘ze zame zide’

In the ‘E’ isomer, they are ‘enemies’.

OCR mod. 4 Organic Chemistry (7 decks)

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