MHT CET · Chemistry · General Organic Chemistry
Which among following compounds contains phantom atom?
- A \(\mathrm{CH}_{3} \mathrm{COOH}\)
- B \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}\)
- C \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{NH}_{2}\)
- D \(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}\)
Answer & Solution
Correct Answer
(A) \(\mathrm{CH}_{3} \mathrm{COOH}\)
Step-by-step Solution
Detailed explanation
New rule: Expand out multiple bonds with "Phantom atoms"
In order to properly compare, we "expand out" all multiple bonds and treat them as single bonds attached to "phantom atoms" (in blue). Phantom Atoms is a pseudoconcept which is only introduced when double and triple bonds are present in compound.
Note that the process of assigning "phantom atoms" to the nitrogen involves looking "backwards" towards the chiral center. This is the only case we ever do this!
In order to properly compare, we "expand out" all multiple bonds and treat them as single bonds attached to "phantom atoms" (in blue). Phantom Atoms is a pseudoconcept which is only introduced when double and triple bonds are present in compound.
Note that the process of assigning "phantom atoms" to the nitrogen involves looking "backwards" towards the chiral center. This is the only case we ever do this!
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