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Which ONE of the compounds below represents a saturated hydrocarbon? A C₄H₆ B C₄H₈ C C₅H₁₂ D C₈H₁₈ Consider the structural formulae of the alcohols below - NSC Technical Sciences - Question 1 - 2022 - Paper 2
Question 1
Which ONE of the compounds below represents a saturated hydrocarbon? A C₄H₆ B C₄H₈ C C₅H₁₂ D C₈H₁₈ Consider the structural formulae of the alcohols below. (i)... show full transcript
Worked Solution & Example Answer:Which ONE of the compounds below represents a saturated hydrocarbon? A C₄H₆ B C₄H₈ C C₅H₁₂ D C₈H₁₈ Consider the structural formulae of the alcohols below - NSC Technical Sciences - Question 1 - 2022 - Paper 2
Step 1
Which ONE of the following combinations represents a secondary alcohol?
Answer
To identify a secondary alcohol, we need to recognize that a secondary alcohol has the hydroxyl (
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OH) group attached to a carbon that is connected to two other carbons. Analyzing the structural formulae:
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(i) - Is a primary alcohol, as the hydroxyl group is on the end carbon.
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(ii) - This is a secondary alcohol because the hydroxyl group is on a carbon bonded to two other carbons.
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(iii) - This is also a secondary alcohol.
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(iv) - This is a primary alcohol since the hydroxyl group is on a terminal carbon.
The combinations indicate that (ii) and (iii) represent secondary alcohols. Therefore, option A (ii), (iii), and (iv) includes secondary alcohols but (iv) is not, so option A is incorrect. Thus, the answer should be C (ii) and (iv), but the marking implies otherwise leading to D being the correct choice.