Question:medium
Which of the following compounds is most reactive in S$_N$1 reaction?
Which of the following compounds is most reactive in S$_N$1 reaction?
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Using a simple frame or just bolding for the box
Key Points:
S$_N$1 reactivity is determined by carbocation stability. Carbocation stability order: 3$\textdegree$>2$\textdegree$>1$\textdegree$>methyl.
Resonance significantly stabilizes carbocations (Allylic, Benzylic).
More extensive resonance leads to greater stability.
Antiaromatic carbocations are extremely unstable.
The heptatrienyl cation (from B) is the most stable due to extensive conjugation.
S$_N$1 reactivity is determined by carbocation stability. Carbocation stability order: 3$\textdegree$>2$\textdegree$>1$\textdegree$>methyl.
Resonance significantly stabilizes carbocations (Allylic, Benzylic).
More extensive resonance leads to greater stability.
Antiaromatic carbocations are extremely unstable.
The heptatrienyl cation (from B) is the most stable due to extensive conjugation.
Updated On: Nov 28, 2025
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