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CHM 102 > Alkenes > Flashcards

Alkenes Flashcards

1
Q

Alkenes are what kind of hydrocarbons

A

Unsaturated hydrocarbons

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2
Q

Alkenes have the general formula

A

CnH2n

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3
Q

Unsaturated hydrocarbons are ………

Hybridized

A

Sp2

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4
Q

Pyrolysis means…..

A

Burning by fire

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5
Q

In the industrial preparation of alkenes what condition is required

A

Cracking/Pyrolysis

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6
Q

In the dehydration of ethanol conc sulphuric acid play what role

A

It plays the role of a dehydrating agent as well as a catalyst.

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7
Q

What is the condition in dehydrohalogenation of haloalkanes for the preparation of alkene

A

Heat and alcoholic potassium hydroxide(KOH)

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8
Q

Dehydrohalogenation proceeds more easily in

A

Secondary and tertiary haloalkanes

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9
Q

Condition necessary for the partial reduction of alkyne for the preparation of alkenes……

A

Hydrogen in the presence of Lindlar agent.

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10
Q

What are the products in the industrial method of preparation of alkenes

A

Alkene and hydrogen

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11
Q

Tetrachloromethane is also known as

A

Carbon tetrachloride (CCL4)

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12
Q

Tests for unsaturation are…..

A

Hydroxylation
Addition of Bromine water
Addition of Halogens

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13
Q

What is polymerization?

A

Polymerization is the process by which small molecules/monomers join together to form very large molecules/macromolecules/polymers.

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14
Q

List the synthetic preparations of alkenes

A

Partial reduction alkynes
Dehydrohalogenation of haloalkanes
Dehydration of ethanol

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15
Q

List the synthetic preparations of Alkanes

A

Hydrogenation of Alkenes
Reduction of Haloalkanes
From Grignard reagent(RMgX- Alkyl- Magnesium halide)
Kolbe’ synthesis
Wurtz synthesis

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16
Q

What type of bonds does alkenes have

A

1 pi-bond
1 sigma-bond

17
Q

In dehydration of ethanol, for the synthetic preparation of alkene, what temperature and catalyst is required

A

Conc H²SO⁴
170°C

18
Q

What is the reactant in the industrial preparation of an alkene?

A

Petroleum

19
Q

Alkenes are takes place at low temperature. True or false.

A

Alkenes takes place at high temperature, therefore its endothermic.

20
Q

Which of the following is not colourless.
Butene
Ethene
Propene
Methene

A

Ethane, because due to the lack of C-C bond.

21
Q

Baeyer’s reagent is used to detect

A

Double-bonds

22
Q

Cis-isomerism in alkenes is due to

A

Restricted rotation around the double bond

23
Q

Which of the following reactions is common in alkenes:
Addition
Elimination
Substitution
Superposition

A

Addition reaction

24
Q

Ethylene bromide on treatment with Zn gives

A

Alkene

25
Q

Another name for an alkene is…..

A

Olefin

26
Q

For chemical industry the most important alkenes are

A

Propene, ethene, 1,3-butadiene

27
Q

What is the solubility of alkenes

A

Alkenes are less soluble in water due to weak van-waal forces.

28
Q

Are alkenes acidic or basic

A

Alkenes are weak bases because the Pi electrons are only avaliable after breaking the pi-bond fordt6

29
Q

Why are alkenes more reactive than alkanes

A

Due to the relative instability of the double bond

30
Q

How do u test for Alkene

A

Use Bromine water.
There is no change when Bromine water is mixed with alkane, but it turns colourless when mixed with alkene.

31
Q

What are the applications of alkenes

A

Used in the synthesis of alcohol,plastic, detergent, lacquers and fuel as starting material

32
Q

How do you identify a double bond in an alkene

A

Bromine water can be used to identify the position of a double bond. In this reaction, the red-brown colour of Bromine turns into colourless, indicating that there is a double bond.

33
Q

What are the main sources of alkenes

A

Oil and natural gas

34
Q

What is the oxidising agent of alkene

A

Osmium tetroxide (OsO⁴)

35
Q

What is the name of an alkene with oxygen

A

Epoxides

CHM 102 (10 decks)

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