MDCAT ECAT Chemistry MCQs with Answers – All Units – Page 23

Question 441 Chemistry of Hydrocarbons

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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Question 442 Chemistry of Hydrocarbons

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

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Question 443 Chemistry of Hydrocarbons

Which statement correctly describes the shape of an ethene molecule?

Correct answer B. Planar, with bond angles of about 120°

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Question 444 Fundamental Principles of Organic Chemistry

Which event led to the rejection of the vital force theory?

Correct answer A. Wöhler's synthesis of urea from ammonium cyanate

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Question 445 Fundamental Principles of Organic Chemistry

Modern organic chemistry is best defined as the chemistry of ____.

Correct answer B. hydrocarbons and their derivatives

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Question 446 Fundamental Principles of Organic Chemistry

Pyridine, C₅H₅N, is classified as a(n) ____ compound.

Correct answer D. heterocyclic aromatic

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Question 447 Fundamental Principles of Organic Chemistry

Cyclohexane is classified as a(n) ____ compound.

Correct answer D. alicyclic

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Question 448 Fundamental Principles of Organic Chemistry

Open-chain organic compounds such as butane are also called ____ compounds.

Correct answer C. acyclic or aliphatic

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Question 449 Fundamental Principles of Organic Chemistry

Which functional group is present in CH₃COCH₃?

Correct answer D. Ketone

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Question 450 Fundamental Principles of Organic Chemistry

Which functional group is present in CH₃COOCH₂CH₃?

Correct answer A. Ester

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Question 451 Fundamental Principles of Organic Chemistry

The functional group –CONH₂ is characteristic of ____.

Correct answer A. amides

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Question 452 Fundamental Principles of Organic Chemistry

Which functional group is present in propanal, CH₃CH₂CHO?

Correct answer A. Aldehyde

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Question 453 Fundamental Principles of Organic Chemistry

Ethanol (C₂H₅OH) and methoxymethane (CH₃OCH₃) are an example of ____ isomerism.

Correct answer D. functional group

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Question 454 Fundamental Principles of Organic Chemistry

How many structural isomers are possible for the alkane C₅H₁₂?

Correct answer B. 3

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Question 455 Fundamental Principles of Organic Chemistry

How many structural isomers are possible for the alkane C₆H₁₄?

Correct answer D. 5

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Question 456 Fundamental Principles of Organic Chemistry

Propan-1-ol and propan-2-ol are related by ____ isomerism.

Correct answer A. position

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Question 457 Fundamental Principles of Organic Chemistry

Ethoxyethane (C₂H₅OC₂H₅) and 1-methoxypropane (CH₃OC₃H₇) illustrate ____.

Correct answer D. metamerism

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Question 458 Fundamental Principles of Organic Chemistry

Propanone and prop-1-en-2-ol, which exist in a dynamic equilibrium, are an example of ____.

Correct answer B. tautomerism

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Question 459 Fundamental Principles of Organic Chemistry

Which of the following alkenes shows cis-trans (geometric) isomerism?

Correct answer C. But-2-ene

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Question 460 Fundamental Principles of Organic Chemistry

Which compound is optically active?

Correct answer A. Butan-2-ol

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