## Chemistry and Chemical Reactivity (9th Edition)

a, b) Atom 1 is $sp^2$ hybridized because it makes a double bond, which makes angle A 120°. Atoms 2 to 5 are $sp^3$ hybridized because they make single bonds only, which makes angles B, C and D approximately 109°. c) The O-H bonds are the most polar because they have the biggest difference in electronegativity between the ligands.