Which element is in the same group as carbon?

look at the attached photo

Which element is least likely to undergo a chemical reaction

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound