Class 12 Chemistry · Chapter 3 · Test 2
Organic Reactions and Mechanisms
50 MCQs
50 questions · 45 min · 50 marks
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Sample questions
The first 5 of 50. Try each one, then tap to see the answer.
Question 1
The formula showing the actual number of atoms of each element in a molecule is the:
- AMolecular formula
- BEmpirical formula
- CDisplayed formula
- DCondensed formula
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Answer: A
This is the definition of the molecular formula.
Question 2
What is the molecular formula of butane?
- AC4H8
- BC4H10
- CC3H8
- DC5H12
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Answer: B
Butane is C4H10.
Question 3
Ethanol and methoxymethane both have the molecular formula:
- AC2H4O
- BC2H5O
- CC2H6O
- DC3H6O
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Answer: C
Two different compounds can share one molecular formula (C2H6O).
Question 4
The smallest whole-number ratio of atoms of each element in a compound is the:
- AMolecular formula
- BStructural formula
- CDisplayed formula
- DEmpirical formula
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Answer: D
This is the definition of the empirical formula.
Question 5
The empirical formula of butane (C4H10) is:
- AC2H5
- BC4H5
- CCH3
- DC2H10
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Answer: A
Dividing C4H10 by 2 gives C2H5.
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