These are isomeric compounds that have the same molecular formula but different structural formulas. Each compound has a different arrangement of atoms and functional groups, leading to different chemical and physical properties. Here is a breakdown of each compound:

C2H6: Ethane, a simple alkane with two carbon atoms and six hydrogen atoms bonded together.C2H5Br: Ethyl bromide, an alkyl halide with a bromine atom attached to an ethyl group.C2H5OH: Ethanol, a primary alcohol with an ethyl group bonded to a hydroxyl group.CH3COOC2H5: Ethyl acetate, an ester formed from acetic acid and ethanol.CH3COOH: Acetic acid, a carboxylic acid with a methyl group and a carboxyl group.CH3COOK: Potassium acetate, the potassium salt of acetic acid.