the following tests on an unknown substance A

a student performed the following tests on an unknown substance A:-Br2 dark and CHCl3/AlCl3tests were negative but Br2light was positive and gave an acidic Litmus test-the compound was partially water soluble and soluble in all organic solvents tested-the product could not be extracted into alkaline water froman ether solution-the test with 2 4-dinitrophenylhydrazine failed-the lucas reagent gave a moderately fast reaction-the CrO3/H2SO4test positive; but the product could not be extracted into alkaline water;-the I2/ NaOH test was positive; after partitioning the product between water and ether the aqueous phase was acidified and extracted with fesh ether and the ethe layer was distilled to give liquid with a strong vinegary smell boiling at the same boiling point as propanoic acid-the sodiumtest produced copious amounts of the bubbling ( the gas was identified as H2 by flame test)use these results to infer the structure of compound