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2nd chemistry > 2nd Sem Midterm Chem Lec Alkenes & Allynes Quiz > Flashcards

2nd Sem Midterm Chem Lec Alkenes & Allynes Quiz Flashcards

1
Q

What is the process called when an alkyl halide undergoes the loss of a hydrogen and a halide to form an alkene?

A

Dehydrohalogenation

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2
Q

Which strong base is commonly used in dehydrohalogenation reactions?

A

Potassium hydroxide

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3
Q

What is the product of dehydrohalogenation of ethyl chloride with potassium hydroxide?

a) Ethene + Potassium Chloride + Water
b) Ethane + Potassium Chloride + Water
c) Ethene + Sodium Chloride + Water
d) Ethane + Sodium Chloride + Water

A

Ethene + Potassium Chloride + Water

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4
Q

What acid is commonly used as a dehydrating agent in the dehydration of alcohols?
a) Hydrochloric acid
b) Nitric acid
c) Sulfuric acid
d) Acetic acid

A

Sulfuric acid

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5
Q

What is the product of the dehydration of isopropyl alcohol?

a) Propene
b) Propane
c) Ethene
d) Ethane

A

Propene

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6
Q
  1. What type of reaction converts alkenes to alkanes by adding hydrogen in the presence of a catalyst?
    a) Substitution
    b) Addition
    c) Elimination
    d) Oxidation
A

Addition

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7
Q
  1. Which catalyst is commonly used in the addition of hydrogen to alkenes?
    a) Nickel
    b) Copper
    c) Iron
    d) Zinc
A

Nickel

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8
Q
  1. What is the product of the addition of hydrogen to ethene?
    a) Ethane
    b) Ethene
    c) Ethanol
    d) Ethyne
A

Ethane

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9
Q

What type of reaction occurs when a halogen molecule is added to the carbon-carbon double bond of an alkene?
a) Substitution
b) Addition
c) Elimination
d) Rearrangement

A

Addition

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10
Q

What is the product of the addition of chlorine to ethene?
a) Chloroethane
b) Dichloroethane
c) Ethanol
d) Ethane

A

Dichloroethane

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11
Q

What is the key reagent used in the addition of halogens to alkenes?
a) Brine
b) Halogen salt
c) Halogen molecule
d) Halogen gas

A

Halogen molecule

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12
Q

What type of bond is formed when a pi bond (double bond) reacts with a halogen molecule?
a) Covalent bond
b) Ionic bond
c) Metallic bond
d) Hydrogen bond

A

Covalent bond

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13
Q

What is the product of the addition of bromine to propene?
a) Bromopropane
b) Dibromopropane
c) Propyl bromide
d) Bromoethane

A

Dibromopropane

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14
Q

In the dehydrohalogenation of alkyl halides, what happens to the halogen atom?
a) It is reduced to form a halide salt.
b) It combines with the alkene to form a new compound.
c) It is removed as a halide ion.
d) It remains unchanged

A

It is removed as a halide ion.

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15
Q

Which of the following is NOT a commonly used strong base in dehydrohalogenation reactions?
a) Sodium hydroxide
b) Potassium hydroxide
c) Calcium hydroxide
d) Lithium hydroxide

A

Calcium hydroxide

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16
Q

What role does sulfuric acid play in the dehydration of alcohols?
a) It acts as a reducing agent.
b) It serves as a catalyst.
c) It acts as a dehydrating agent.
d) It forms a complex with the alcohol.

A

It acts as a dehydrating agent.

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17
Q
  1. What is the product of the dehydration of ethanol?
    a) Ethene
    b) Ethane
    c) Diethyl ether
    d) Ethanol
A

Ethene

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18
Q
  1. Which of the following is NOT a common catalyst used in the addition of hydrogen to alkenes?
    a) Platinum
    b) Palladium
    c) Rhodium
    d) Silver
A

Silver

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19
Q
  1. What is the general formula for the addition of hydrogen to an alkene?
    a) CnH2n + H2
    b) CnH2n + 2
    c) CnH2n-2 + H2
    d) CnH2n-2 + 2H2
A

CnH2n+2

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20
Q

What type of reaction is the addition of halogens to alkenes?
a) Redox reaction
b) Acid-base reaction
c) Nucleophilic substitution
d) Electrophilic addition

A

Electrophilic addition

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21
Q

What is an unsaturated hydrocarbon?
a) A hydrocarbon with only single bonds
b) A hydrocarbon with one or more carbon-carbon multiple bonds
c) A hydrocarbon with no carbon atoms
d) A hydrocarbon with only double bonds

A

A hydrocarbon with one or more carbon-carbon multiple bonds

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22
Q

What is the functional group of an alkene?
a) C-C single bond
b) C-C triple bond
c) C=C double bond
d) C-H bond

A

C=C double bond

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23
Q

What is the general formula for an alkene?
a) CnH2n
b) CnH2n+2
c) CnHn
d) CnH2n-2

A

CnH2n

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24
Q

How is the presence of a double bond indicated in the IUPAC name of an alkene?
a) By adding the prefix “di-“
b) By adding the suffix “-ene”
c) By adding the prefix “cis-“
d) By adding the suffix “-ane”

A

By adding the suffix “-ene”

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25
Q

In naming alkenes, which carbon atoms are assigned the lowest numbers in the parent chain?
a) Those with the highest priority substituents
b) Those with the fewest substituents
c) Those with the functional group
d) Those with the longest alkyl chains

A

Those with the functional group

26
Q

Which rule governs the naming of alkene compounds with multiple double bonds?
a) Rule 1
b) Rule 2
c) Rule 3
d) Rule 4

27
Q

What is the IUPAC name for CH3-CH=CH-CH2-CH3?
a) 1-butene
b) 2-butene
c) 2-pentene
d) 3-pentene

28
Q

What is the common name for the alkene with the IUPAC name “ethene”?
a) Ethylene
b) Propylene
c) Butylene
d) Methane

29
Q

How is the common name for an alkene with two alkyl groups bonded to two carbon atoms indicated if they are symmetrically situated?
a) By using the prefix “sym-“
b) By using the prefix “cis-“
c) By using the prefix “trans-“
d) By using the prefix “unsym-“

A

By using the prefix “sym-“

30
Q

What is the IUPAC name for the alkene with the common name “propene”?
a) 1-butene
b) 2-butene
c) 1-propene
d) 2-propene

31
Q

Which of the following is NOT a method for preparing alkenes?
a) Dehydration of alcohols
b) Dehydrohalogenation of alkyl halides
c) Reduction of alkynes
d) Cracking of hydrocarbons

A

Reduction of alkynes

32
Q

What is the common name for the alkene with the IUPAC name “butadiene”?
a) Butylene
b) Ethylene
c) Divinyl
d) Propylene

33
Q

What is the IUPAC name for CH2=CH-CH=CH2?
a) 1,2-butadiene
b) 1,3-butadiene
c) 2,3-butadiene
d) 1,4-butadiene

A

1,3 butadiene

34
Q
  1. Which carbon atoms are assigned the lowest numbers in the IUPAC name of an alkene?
    a) Those with the highest priority substituents
    b) Those with the fewest substituents
    c) Those with the functional group
    d) Those with the longest alkyl chains
A

Those with the functional group

35
Q

How are substituents named in alkenes with multiple substituents?
a) In alphabetical order
b) By the longest substituent first
c) By the shortest substituent first
d) By the substituent closest to the functional group first

A

In alphabetical order

36
Q

What is the common name for CH2=C=CH2?
a) Butylene
b) Propyne
c) Allene
d) Ethylene

37
Q

What is the IUPAC name for the alkene with the common name “allyl ethylene”?
a) 1-propene
b) 2-propene
c) 1-butene
d) 2-butene

38
Q

Which prefix is used in the common name to indicate unsymmetrically located alkyl groups?
a) “sym-“
b) “cis-“
c) “trans-“
d) “unsym-“

39
Q

What is the IUPAC name for the alkene with the common name “methyl ethylene”?
a) 1-propene
b) 2-propene
c) 1-butene
d) 2-butene

40
Q

Which of the following is NOT a true statement about alkadienes?
a) They have two double bonds.
b) They have the suffix “-diene” in IUPAC names.
c) The parent chain is numbered to give the lowest number to the double bonds.
d) They are named similarly to alkenes.

A

They are named similarly to alkenes.

41
Q

What is the functional group of an alkyne?
a) C-C single bond
b) C=C double bond
c) C≡C triple bond
d) C-H bond

A

C≡C triple bond

42
Q

What is the general formula for an alkyne with one triple bond?
a) CnH2n
b) CnH2n+2
c) CnH2n-2
d) CnHn

43
Q

What is the IUPAC name for CH≡CH?
a) Ethylene
b) Propylene
c) Acetylene
d) Butylene

44
Q

What is the common name for the smallest alkyne?
a) Ethylene
b) Propylene
c) Acetylene
d) Butylene

45
Q

How is the systematic name of an alkyne obtained?
a) By adding the suffix “-ene” to the alkane name
b) By adding the suffix “-yne” to the alkane name
c) By adding the prefix “di-“ to the alkane name
d) By adding the prefix “tri-“ to the alkane name

A

By adding the suffix “-yne” to the alkane name

46
Q

Which carbon atoms are assigned the lowest numbers in the IUPAC name of an alkyne?
a) Those with the highest priority substituents
b) Those with the fewest substituents
c) Those with the functional group
d) Those with the longest alkyl chains

A

Those with the functional group

47
Q

What is the common name for CH3-C≡CH?
a) Methyl ethylene
b) Ethyl ethylene
c) Methyl acetylene
d) Ethyl acetylene

A

Methyl acetylene

48
Q

What is the IUPAC name for CH3-C≡CH?
a) Ethyne
b) Propyne
c) Butyne
d) Pentene

49
Q

What is the systematic name for the alkene with the common name “methylacetylene”?
a) Ethyne
b) Propyne
c) Butyne
d) Pentene

50
Q

What is the common name for the alkene with the IUPAC name “propyne”?
a) Ethylene
b) Propylene
c) Acetylene
d) Butylene

51
Q

What is the IUPAC name for CH3-CH2-C≡CH?
a) 1-butyne
b) 2-butyne
c) 1-pentyne
d) 2-pentyne

52
Q

Which type of alkyne has the triple bond located at the end of the carbon chain?
a) Terminal alkyne
b) Internal alkyne
c) Symmetrical alkyne
d) Unsymmetrical alkyne

A

Terminal alkyne

53
Q

What is the general formula for an alkyne with three carbon atoms?
a) C3H6
b) C3H4
c) C3H8
d) C3H10

54
Q

What is the systematic name for the alkene with the common name “propyne”?
a) Ethene
b) Propene
c) Butene
d) Pentene

55
Q

What is the common name for the alkene with the IUPAC name “butyne”?
a) Ethylene
b) Propylene
c) Acetylene
d) Butylene

56
Q

Which prefix is used in the common name to indicate unsymmetrically located alkyl groups?
a) “sym-“
b) “cis-“
c) “trans-“
d) “unsym-“

57
Q

What is the IUPAC name for the alkene with the common name “dimethylacetylene”?
a) 1-butyne
b) 2-butyne
c) 1-pentyne
d) 2-pentyne

58
Q

What is the common name for CH3-CH2-CH-C≡CH?
a) 1-butyne
b) 2-butyne
c) 1-pentyne
d) 2-pentyne

59
Q

What is the IUPAC name for CH3-(CH2)3-CH═CH-C≡CH?
a) 3-hexen-1-yne
b) 2-hexen-3-yne
c) 4-hexen-2-yne
d) 1-hexen-4-yne

A

4-hexen-2-yne

60
Q

What is the common name for CH≡C-CH2-CH2-CH2?
a) 1-buten-3-yne
b) 1-pentyn-3-ene
c) 2-hexen-4-yne
d) 2-heptyn-4-ene

A

1-buten-3-yne

2nd chemistry (5 decks)

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