What is the main organic product when bromoethane is heated with alcoholic potassium hydroxide?
Correct answer B. Ethene
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Chemistry of Hydrocarbons MCQs
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What is the IUPAC name of CH₃CH=C(CH₃)CH₃?
Correct answer D. 2-Methylbut-2-ene
What is the major product when propene reacts with hydrogen bromide in the absence of peroxides?
Correct answer B. 2-Bromopropane
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What mass of bromine reacts completely with 5.6 g of ethene (C = 12, H = 1, Br = 80)?
Correct answer B. 32 g
All carbon-carbon bonds in benzene have a length of about 139 pm. This value is ____.
Correct answer C. between a C–C single bond (154 pm) and a C=C double bond (134 pm)
According to molecular orbital theory, how many electrons occupy the delocalised π system of benzene?
Correct answer B. 6
Why does benzene usually undergo substitution rather than addition reactions?
Correct answer C. Substitution keeps the stable delocalised π system intact, whereas addition would destroy it
In the nitration of benzene with a mixture of concentrated nitric and sulphuric acids, the electrophile is ____.
Correct answer C. NO₂⁺
In the sulphonation of benzene with fuming sulphuric acid, the attacking electrophile is ____.
Correct answer B. SO₃
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Which substance is used as a catalyst for the bromination of benzene?
Correct answer D. FeBr₃
What is the main organic product when benzene reacts with chloromethane in the presence of anhydrous AlCl₃?
Correct answer C. Methylbenzene
What is the IUPAC name of (CH₃)₂CHCH₂CH₃?
Correct answer B. 2-Methylbutane
Which statement correctly describes the shape of an ethene molecule?
Correct answer B. Planar, with bond angles of about 120°
What mass of carbon dioxide is produced by the complete combustion of 3.0 g of ethane (C = 12, H = 1, O = 16)?
Correct answer C. 8.8 g
Small amounts of ethane are found among the products of the chlorination of methane. Which step forms it?
Correct answer B. CH₃• + CH₃• → C₂H₆
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In the chlorination of methane in sunlight, the initiation step is ____.
Correct answer B. homolytic fission of Cl₂ into two chlorine radicals