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Lesson 3: Alkynes (Acetylene) and Cyclic Hydrocarbons — Picture questions (exam style)

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1.
Study the scheme. Which option is correct?
Study the scheme. Which option is correct?
(A): benzene, (B): ethylbenzene
(A): benzene, (B): methylbenzene
(A): methylbenzene, (B): ethylbenzene
(A): cyclohexane, (B): ethylbenzene
2.
Starting from 5.6 g of C₂H₂ in the sequence shown (yield of each step on its arrow, molar masses in brackets). Which option is correct?
Starting from 5.6 g of C₂H₂ in the sequence shown (yield of each step on its arrow, molar masses in brackets). Which option is correct?
mass of C₂H₂Br₄ = 52.2 g, overall yield = 70%
mass of C₂H₂Br₄ = 52.2 g, overall yield = 80%
mass of C₂H₂Br₄ = 74.5 g, overall yield = 80%
mass of C₂H₂Br₄ = 3.92 g, overall yield = 70%
3.
The ethyne from 6.4 g of CaC₂ (64% pure) is passed into bromine water. What is the greatest mass of bromine it can react with? (Br = 80)
The ethyne from 6.4 g of CaC₂ (64% pure) is passed into bromine water. What is the greatest mass of bromine it can react with? (Br = 80)
16.0 g
10.2 g
41.0 g
20.5 g
4.
What is the product (?) of the reaction shown?
What is the product (?) of the reaction shown?
ethane
propene
bromoethene
propanone
5.
Starting from 20 g of C₂H₂ in the sequence shown (yield of each step on its arrow, molar masses in brackets). Which option is correct?
Starting from 20 g of C₂H₂ in the sequence shown (yield of each step on its arrow, molar masses in brackets). Which option is correct?
mass of C₆H₅CH₃ = 51 g, overall yield = 85%
mass of C₆H₅CH₃ = 14.4 g, overall yield = 72%
mass of C₆H₅CH₃ = 51 g, overall yield = 72%
mass of C₆H₅CH₃ = 70.8 g, overall yield = 85%
6.
Study the scheme. Which option is correct?
Study the scheme. Which option is correct?
(B): propan-1-ol, (C): propene
(B): propan-2-ol, (C): propane
(B): propan-2-ol, (C): propene
(B): propan-2-ol, (C): propyne
7.
The ethyne from 0.64 g of CaC₂ (75% pure) is converted completely to ethanal. What mass of ethanal forms? (O = 16, H = 1)
The ethyne from 0.64 g of CaC₂ (75% pure) is converted completely to ethanal. What mass of ethanal forms? (O = 16, H = 1)
0.195 g
0.330 g
0.345 g
1.08 g
8.
Starting from 12.8 g of CaC₂ in the sequence shown (yield of each step on its arrow, molar masses in brackets). Which option is correct?
Starting from 12.8 g of CaC₂ in the sequence shown (yield of each step on its arrow, molar masses in brackets). Which option is correct?
mass of CH₃COOH = 6.2 g, overall yield = 48.4%
mass of CH₃COOH = 12 g, overall yield = 48.4%
mass of CH₃COOH = 5.81 g, overall yield = 48.4%
mass of CH₃COOH = 6.84 g, overall yield = 60%
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