An organic compound absorbs strongly in the IR at 1687 cm^-1.Its ¹H NMR spectrum consists of two signals,a singlet at 2.1 ppm and a multiplet centered at 7.1 ppm.Its mass spectrum shows significant peaks at m/z 120,m/z 105 and m/z 77.This information is consistent with which of the following structures?

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The Answer of An organic compound absorbs strongly in the IR at 1687 cm^-1.Its ¹H NMR spectrum consists of two signals,a singlet at 2.1 ppm and a multiplet centered at 7.1 ppm.Its mass spectrum shows significant peaks at m/z 120,m/z 105 and m/z 77.This information is consistent with which of the following structures?

An Organic Compound Absorbs Strongly in the IR at 1687