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- Which of the following has the highest intensity of mass fragment peak in its mass spectrum? Select one: CHCHCH, HC3CH2 CH=CH-CH, CH,CH,CH,Which fragment correlates to the base peak of the following mass spectrum? 100 80 20 10 20 30 40 50 60 70 80 90 m/z Relative IntensityWhich one is H NMR of A singlet B quartet triplet singlet ppm singlet singlet quartet Pani (ethyl acetoacetate)? triplet C singlet triplet quartet Ppmn singlet D singlet singlet quartet ppm triplet