Which compound is an aldehyde? H. H. H. H. H. 0- H. H. C H-C-CII,-CHI, H,C-C-CH, O C OD OB O A

Introductory Chemistry: An Active Learning Approach
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Chapter13: Structure And Shape
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**Question 26**

**Which compound is an aldehyde?**

Four chemical structures (A, B, C, D) are presented.

- **A**: A structure with a carbon chain that includes a carbon double-bonded to oxygen, with hydrogen atoms bonded to the carbons.

- **B**: A structure with a central carbon double-bonded to oxygen and single-bonded to three hydrogen atoms.

- **C**: A structure with a carbonyl group (C=O) bonded to a CH2 group and a CH3 group.

- **D**: A structure with a carbonyl group (C=O) bonded to a CH3 group and a CCl3 group.

The options provided for answering the question are:
- C
- D
- B
- A

[Graph Explanation]

The graphs provided in this question are molecular structures:

- **Option A** shows a linear arrangement of carbon atoms with a carbonyl group (C=O) and several hydrogen (H) atoms.
  
- **Option B** presents a similar structural arrangement, focusing on a central carbon atoms double-bonded to oxygen.
  
- **Option C** is characterized by a carbonyl group flanked by a methylene (CH2) group and a methyl (CH3) group.
  
- **Option D** displays a carbonyl group bonded to a methyl group and a trichloromethyl (CCl3) group.

**Answer:**

To identify the aldehyde, note that aldehydes have a carbonyl group (C=O) bonded to at least one hydrogen atom. 

In this case, correct option indicating an aldehyde structure is:
- **B**, where a carbonyl group is bonded to a carbon with two hydrogen atoms (H).

Select option B.
Transcribed Image Text:**Question 26** **Which compound is an aldehyde?** Four chemical structures (A, B, C, D) are presented. - **A**: A structure with a carbon chain that includes a carbon double-bonded to oxygen, with hydrogen atoms bonded to the carbons. - **B**: A structure with a central carbon double-bonded to oxygen and single-bonded to three hydrogen atoms. - **C**: A structure with a carbonyl group (C=O) bonded to a CH2 group and a CH3 group. - **D**: A structure with a carbonyl group (C=O) bonded to a CH3 group and a CCl3 group. The options provided for answering the question are: - C - D - B - A [Graph Explanation] The graphs provided in this question are molecular structures: - **Option A** shows a linear arrangement of carbon atoms with a carbonyl group (C=O) and several hydrogen (H) atoms. - **Option B** presents a similar structural arrangement, focusing on a central carbon atoms double-bonded to oxygen. - **Option C** is characterized by a carbonyl group flanked by a methylene (CH2) group and a methyl (CH3) group. - **Option D** displays a carbonyl group bonded to a methyl group and a trichloromethyl (CCl3) group. **Answer:** To identify the aldehyde, note that aldehydes have a carbonyl group (C=O) bonded to at least one hydrogen atom. In this case, correct option indicating an aldehyde structure is: - **B**, where a carbonyl group is bonded to a carbon with two hydrogen atoms (H). Select option B.
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