A Hydrocarbon Shows a Parent Ion Peak in Its Mass $\delta$

question 9

Multiple Choice

A hydrocarbon shows a parent ion peak in its mass spectrum at m/z 102.Its ¹H NMR spectrum shows only two peaks, a singlet at $\delta$ 2.7 (1H) and a multiplet at $\delta$ 7.4 (5H) .The correct structure is:

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