The statement' It can decolorize acidified potassium dichormate solution ' has two mistakes:1. Acidified potassium dichormate solution will change from orange to green when being reduced. NOT decolorize
2. Acidified potassium dichormate is not strong enough to oxidize alkene to alkanediol.
*HOWEVER, acidified potassium dichormate solution can oxidize methanol and ethanol to methanoic acid and ethanoic acid repectively. Further down the homologous series propan-1-ol and Butan-1-ol need a more stronger oxidizing agent that is acidified potassium permanganate.
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