4 2 Analysis shows that a compound has the molecular formula C4H8O2. A student suggests that the compound could be either A or B. CH3CH2CH2COOH or HOCH2CH=CHCH2OH A B (a) Deduce a chemical test which would give a positive result for A but not for B. Include the reagent and observation. 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(b) Deduce a chemical test which would give a positive result for B but not for A. Include the reagent and observation. 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Turn over 5 (c) Another student suggests that the compound could contain an aldehyde and an alcohol functional group, with structure C. HOCH2CH2CH2CHO C Complete the table to show how the infrared spectra of A, B and C would be expected to differ in the wavenumber range 1800-1600 cm−1. Use information from the Data Booklet. (3) Absorbance Wavenumber range / cm−1 Absorbance expected in infrared spectrum of A but not in B or C Absorbance expected in infrared spectrum of B but not in A or C Absorbance expected in infrared spectrum of C but not in A or B (Total for Question 2 = 7 marks)