Question:
What will be the \(m/z\) value of the base peak in the mass spectrum of n-butyl benzene \((PhCH_2CH_2CH_2CH_3)\)?
What will be the \(m/z\) value of the base peak in the mass spectrum of n-butyl benzene \((PhCH_2CH_2CH_2CH_3)\)?
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Alkylbenzenes fragment at the benzylic bond to give the stable tropylium cation.
Updated On: Jul 3, 2026
- 57
- 77
- 91
- 134
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The Correct Option is C
Solution and Explanation
Step 1: Molecular ion C10H14, mass 134.
Step 2: Alkylbenzenes cleave at benzylic C-C bond.
Step 3: Loss of propyl radical (mass 43) gives PhCH2+ at m/z 91.
Step 4: This rearranges to the stable aromatic tropylium cation C7H7+.
Step 5: This dominates as the base peak.
\[\boxed{(C)\ 91}\]Was this answer helpful?
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