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chemistry a - level > Organic Chem Questions > Flashcards

Organic Chem Questions Flashcards

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1
Q

How many isomers have the molecular formula C5H12?
A2
B3
C4
D5

A

B 3

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2
Q

How many structural isomers have the molecular formula C4H9Br? A2
B3
C4
D5

A

C

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3
Q

How many secondary amines have the molecular formula C4H11N?
A2
B3
C4
D5

A

B

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4
Q

Which statement is not correct about the pollutant sulfur dioxide?
A It can be removed from car exhaust gases by a catalytic converter.
B It can be removed from power station flue gases by reaction with calcium oxide.
C It can cause respiratory problems.
D It can cause acid rain.

A

A

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5
Q

Which statement is correct about thermal cracking?
A A pressure between 100 and 200 kPa is used.
B Aromatic hydrocarbons are the major products.
C C–C bonds are broken.
D Zeolite catalysts are used.

A

C

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6
Q

The combustion of petrol in car engines produces the pollutant nitrogen monoxide.
Give an equation for a reaction that removes nitrogen monoxide in a catalytic converter.

A

2NO + 2CO -> N2 + 2CO2

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7
Q

The table shows possible conditions and products for the cracking of alkanes. Which row is correct?
Catalytic

A

Slight temperature high pressure
Mainly branched Oakland’s and aromatics

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8
Q

Which of these substances does not contribute to the greenhouse effect?
A Unburned hydrocarbons.
B Carbon dioxide.
C Water vapour.
D Nitrogen.

A

C

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9
Q

An excess of methane reacts with chlorine in the presence of ultraviolet radiation.
What are the main products of this reaction?
A CCl4 and H2
B CCl4 and HCl
C CH3Cl and H2
D CH3Cl and HCl

A

D

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10
Q

Q11.
Which correctly represents an incomplete combustion of pentane?
A C5H12 + 8O2 ⟶ 5CO2 + 6H2O
B C5H12 +8O2 ⟶4CO+CO2 +6H2O
C C5H12 +6O2 ⟶4CO+CO2 +6H2O
D C5H12 +5O2 ⟶4CO+CO2 +4H2O+2H2

A

C

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11
Q

Which species is produced in a propagation step during the reaction of propane with an excess of chlorine in the presence of UV light?
A H•
B C3H5Cl
C C3H6CL2
D C6H14

A

C

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12
Q

Which molecule is not produced when ethane reacts with bromine in the
presence of ultraviolet light?
A C2H4Br2 B HBr
C H2
D C4H10

A

C

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13
Q

Sulfur dioxide (SO2) is produced when some fossil fuels are burned. Which of the following statements is true?
A Sulfur dioxide can be removed from waste gases in a power station by an acid-base reaction with calcium oxide.
B Sulfur dioxide is insoluble in water.
C Sulfurdioxideisabasicoxide.
D Sulfurdioxideisanioniccompound.

A

A

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14
Q

Tetradecane (C14H30) is an alkane found in crude oil. When tetradecane is heated to a high temperature, one molecule of tetradecane decomposes to form one molecule of hexane and three more molecules.
Which of the following could represent this reaction?
A C14H30 → C6H14 + C4H8 + 2C2H4
B C14H30 → C6H14 + C6H12 + C2H4
C C14H30 → C5H12 + 3C3H6
D C14H30 → C6H14 + C2H6 + 2C3H6

A

A

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15
Q

Write the overall equation for the reaction of fluorine with methane to form trifluoromethane (CHF3)

A

CH4 + 3F2 -> CHF3 + 3HF

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16
Q

Identify a bond in a CFC that is broken by UV radiation to produce a reactive intermediate that catalyses the decomposition of ozone. Write an overall equation for the decomposition of ozone

A

Bond broken - C-Cl
Reactive intermediate - chlorine atom
Overall equation - 2O3 -> 3O2

17
Q

Explain why sulphur compounds found in crude oil should be removed fro mute fractions before they are used for central heating fuel

A

S02 produced in combustion
Which causes acid rain

18
Q

Explain why 1,1,1-trifluoroethane does not lead to the depletion of the ozone in the upper atmosphere

A

Does not contain chlorine

19
Q

Give a reason why bonds in molecules such as carbon dioxide and 1,1,1-trifluoroethane absorb infrared radiation

A

Polar bonds as they vibrate/stretch

20
Q

State the benefit to life on Earth of ozone in the upper atmosphere.

A

Absorbs UV radiation

21
Q

CFC-11 is a greenhouse gas that can contribute to global warming.
State and explain how CFC-11 is able to contribute to global warming.

A

Absorbs UV radiation
Molecule has polar bonds

22
Q

Which is a propagation step in the chlorination of methane?
A H●+Cl2 →HCl+Cl●
B Cl●+CH4 →CH3Cl+H● C ●CH3 +Cl●→CH3Cl
D ●CH3 +Cl2 →CH3Cl+Cl●

A

D

23
Q

Which equation represents a propagation step?
A •CH2Cl + Cl• → CH2Cl2
B •CH3 + •CH3 → C2H6
C Cl2 → Cl• + Cl•
D CH3Cl + Cl• → •CH2Cl + HCl

A

D

24
Q

Which statement is correct about the fractional distillation of crude oil?
A A zeolite catalyst is used.
B Each fraction contains a mixture of hydrocarbons.
C Gaseous fractions are formed by breaking covalent bonds.
D The fractionating column is hottest at the top.

A

B

25
Q

Which equation is a propagation step in the conversion of trichloromethane into tetrachloromethane by reaction with chlorine in the presence of ultraviolet light?
A CHCl3 +Cl2 ⟶CCl4 +HCl
B ●CCl3 + ●Cl ⟶ CCl4
C CHCl3 +●Cl⟶CCl4 +●H
D ●CCl3 +Cl2 ⟶CCl4 +●Cl

A

D

26
Q

Which species is produced in a propagation step during the reaction of propane with an excess of chlorine in the presence of UV light?
A H•
B C3H5Cl
C C3H6CL2
D C6H14

A

C

27
Q

Tetradecane (C14H30) is an alkane found in crude oil. When tetradecane is heated to a high temperature, one molecule of tetradecane decomposes to form one molecule of hexane and three more molecules.
Which of the following could represent this reaction?
A C14H30 → C6H14 + C4H8 + 2C2H4 B C14H30 → C6H14 + C6H12 + C2H4 C C14H30 → C5H12 + 3C3H6
D C14H30 → C6H14 + C2H6 + 2C3H6

A

A

chemistry a - level (16 decks)

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