Question:
Identify the aldehyde from following so that the aldehydic group is NOT attached with any \(sp^3\) hybrid 'c' atom.
Identify the aldehyde from following so that the aldehydic group is NOT attached with any \(sp^3\) hybrid 'c' atom.
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Only formaldehyde has the CHO group attached to hydrogen instead of a carbon.
Updated On: Oct 1, 2026
- Methanal
- Ethanal
- 2-Methyl Propanal
- Propanal
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
In an aldehyde the \(-\text{CHO}\) group is attached to either an alkyl group or to hydrogen. We want the one where it is not attached to any \(sp^3\) carbon.
Step 2: Check the Options:
Methanal, \(\text{HCHO}\): CHO is attached to two hydrogens and no carbon at all. This matches.
Ethanal, \(\text{CH}_3\text{CHO}\): CHO attached to a \(\text{CH}_3\) carbon, which is \(sp^3\).
2-Methylpropanal: CHO attached to the \(sp^3\) CH carbon.
Propanal, \(\text{CH}_3\text{CH}_2\text{CHO}\): CHO attached to an \(sp^3\) \(\text{CH}_2\) carbon.
Step 3: Conclusion:
Only methanal is not bonded to an \(sp^3\) carbon, so (A) is correct.
Final Answer:
Methanal is the only aldehyde with no alkyl carbon next to CHO, option (A). \[ \boxed{\text{(A) Methanal}} \]
In an aldehyde the \(-\text{CHO}\) group is attached to either an alkyl group or to hydrogen. We want the one where it is not attached to any \(sp^3\) carbon.
Step 2: Check the Options:
Methanal, \(\text{HCHO}\): CHO is attached to two hydrogens and no carbon at all. This matches.
Ethanal, \(\text{CH}_3\text{CHO}\): CHO attached to a \(\text{CH}_3\) carbon, which is \(sp^3\).
2-Methylpropanal: CHO attached to the \(sp^3\) CH carbon.
Propanal, \(\text{CH}_3\text{CH}_2\text{CHO}\): CHO attached to an \(sp^3\) \(\text{CH}_2\) carbon.
Step 3: Conclusion:
Only methanal is not bonded to an \(sp^3\) carbon, so (A) is correct.
Final Answer:
Methanal is the only aldehyde with no alkyl carbon next to CHO, option (A). \[ \boxed{\text{(A) Methanal}} \]
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