7.27 How many hydrogens does each of the following compounds have? (a) CsH₂O₂, has two rings and one double bond (b) C-H₂N, has two double bonds (c) C₂H₂NO, has one ring and three double bonds

1) Consider the following 5 compounds: NH2 H3C- NHh = white Cos H=red NH2 NH2 NH2 COOH H- -COOH COOH H3C čOOH NH2 čOOH H3C H- -NH2 ČOOH II II H3C H NH2 COOH H, COOH H3C. COOH NH2 NH2 COOH NH2 IV Indicate which of the following TWO structures are described by the following (use all ten a. possible combinations, +&4, I & II, &-V, 1& V, I & I,tt&V, H&V, II & IV, II & V, V-& Identical:+V, Enantiomers: | V,1-11 Diastereomers: lIV IV, N V b. Indicate which of the above compounds WILL rotate plane polarized light when dissolved in solution by writing their Roman numeral(s) here.

7) How many isomers can you construct for the molecular formula C,H,O? Use a red ball with two holes for the oxygen atom. Draw a dash structural representation of each structure.

Ch

Problem 2.12 Which cycloalkanes show cis,trans isomerism? For each that does, draw both isomers. (a) (b) (c)

What is the Lewis Structure of CH2Se, the steric number, the electron pair geometry, the molecular geometry, and how many double bonds does it have?