Bromine is a chemical element with symbol Br and atomic number 35.
Carbon (from carbo "coal") is a chemical element with symbol C and atomic number 6.
A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs.
The haloalkanes (also known as halogenoalkanes or alkyl halides) are a group of chemical compounds derived from alkanes containing one or more halogens.
Hydrogen is a chemical element with symbol H and atomic number 1.