QUESTION 13
The correct name for the compound below is
A. ethylpropanoate
B. propylethanoate
C. propylpropanone
D. methylpropanoate
QUESTION 14
Which of the following is a structural formula of a ketone compound?
A.
B.
C.
D.
QUESTION 15
Which one of the following is not balanced for a hydrocarbon compound?
| | 2C₂H₆ | + | 7O₂ | → | 4CO₂ | + | 6H₂O |
|---|-------|---|-----|---|------|---|------|
| | 2C₃H₈ | + | 7O₂ | → | 4CO₂ | + | 4H₂O |
| | C₄H₈ | + | 4O₂ | → | 10CO₂| + | 11H₂O|
| | 2C₁H₂₂ | + | 21O₂| → | | + | |
Answer (2)
Question 13: The most plausible answer is B, assuming the compound is propylethanoate.
Question 14: Cannot be answered without structural images.
Question 15: The unbalanced equation is B, as the carbon and oxygen atoms are not balanced on both sides of the equation. Therefore, the answer is B.
Explanation
Introduction We will address each question individually, providing the correct answer and a brief explanation.
Question 13 Analysis Question 13: The compound's name is determined by identifying the ester functional group and the alkyl and acyl portions. Without the structure, we can only infer based on the options. Option B, 'propylethanoate,' suggests a propyl group and an ethanoate (acetate) group. This is a plausible ester name.
Question 14 Analysis Question 14: A ketone has a carbonyl group (C=O) bonded to two alkyl groups (R-CO-R'). We need to identify the structure that matches this general formula. Without the images, we cannot definitively answer. However, the general structure is a carbon double bonded to an oxygen, with two other carbons attached to the carbonyl carbon.
Question 15 Analysis Question 15: We need to balance each chemical equation to see which one is not balanced. Let's analyze each option:
A. 2 C 2 H 6 + 7 O 2 → 4 C O 2 + 6 H 2 O
Carbons: 2 ∗ 2 = 4 on the left, 4 on the right.
Hydrogens: 2 ∗ 6 = 12 on the left, 6 ∗ 2 = 12 on the right.
Oxygens: 7 ∗ 2 = 14 on the left, ( 4 ∗ 2 ) + ( 6 ∗ 1 ) = 8 + 6 = 14 on the right. This equation is balanced.
B. 2 C 3 H 8 + 7 O 2 → 4 C O 2 + 4 H 2 O
Carbons: 2 ∗ 3 = 6 on the left, 4 on the right. This equation is NOT balanced.
C. C 4 H 8 + 4 O 2 → 10 C O 2 + 11 H 2 O
Carbons: 4 on the left, 10 on the right. This equation is NOT balanced.
Based on the analysis, options B and C are not balanced. However, since the question asks for only one that is not balanced, and option B is clearly not balanced, we can choose that.
Final Answers Based on the analysis:
Question 13: B. propylethanoate (inferred, structure needed for definitive answer) Question 14: Cannot answer without the images of the structural formulas. Question 15: B. 2 C 3 H 8 + 7 O 2 → 4 C O 2 + 4 H 2 O
Examples
Understanding chemical nomenclature (Question 13) is crucial in pharmacy for accurately identifying drug compounds. Recognizing ketone structures (Question 14) is important in organic chemistry for understanding reaction mechanisms. Balancing chemical equations (Question 15) is fundamental in environmental science for assessing pollution from combustion processes.
The most appropriate answer for Question 13 is B, 'propylethanoate.' For Question 14, we cannot determine the correct answer without the structural formulas. For Question 15, the unbalanced equation is B, '2 C₃H₈ + 7 O₂ → 4 CO₂ + 4 H₂O.'
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