Question:
Which from the following aldehydes contains two \(-\text{CHO}\) groups in a molecule?
Which from the following aldehydes contains two \(-\text{CHO}\) groups in a molecule?
Show Hint
Phthaldehyde is benzene-1,2-dicarbaldehyde, so it has two CHO groups.
Updated On: Oct 1, 2026
- Acrolein
- O-Tolualdehyde
- Phthaldehyde
- Butyraldehyde
Show Solution
Verified By Collegedunia
The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept:
We need the common-name aldehyde whose structure carries two \(-\text{CHO}\) groups.
Step 2: Check Each Option:
Acrolein (propenal): \(\text{CH}_2=\text{CH}-\text{CHO}\), one CHO group.
o-Tolualdehyde: 2-methylbenzaldehyde, one CHO group on the ring.
Phthaldehyde: benzene-1,2-dicarbaldehyde, \(\text{C}_6\text{H}_4(\text{CHO})_2\), two CHO groups.
Butyraldehyde (butanal): \(\text{CH}_3\text{CH}_2\text{CH}_2\text{CHO}\), one CHO group.
Step 3: Conclusion:
Only phthaldehyde contains two aldehyde groups.
Final Answer:
Phthaldehyde has two CHO groups, option (C). \[ \boxed{\text{(C) Phthaldehyde}} \]
We need the common-name aldehyde whose structure carries two \(-\text{CHO}\) groups.
Step 2: Check Each Option:
Acrolein (propenal): \(\text{CH}_2=\text{CH}-\text{CHO}\), one CHO group.
o-Tolualdehyde: 2-methylbenzaldehyde, one CHO group on the ring.
Phthaldehyde: benzene-1,2-dicarbaldehyde, \(\text{C}_6\text{H}_4(\text{CHO})_2\), two CHO groups.
Butyraldehyde (butanal): \(\text{CH}_3\text{CH}_2\text{CH}_2\text{CHO}\), one CHO group.
Step 3: Conclusion:
Only phthaldehyde contains two aldehyde groups.
Final Answer:
Phthaldehyde has two CHO groups, option (C). \[ \boxed{\text{(C) Phthaldehyde}} \]
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