Example Identify all possible structural and stereoisomers that can result from the addition polymerization of (a) butadiene (b) chloroprene HHHH HCI H H C-C=C C=C-C=C H H H (a) (b)

There are four dimethylcyclopropane isomers. (a) Write three-dimensional formulas for these isomers. (b) Which of the isomers are chiral? (c) If a mixture consisting of 1 mol of each of these isomers were subjected to simple gas chromatography, how many fractions would be obtained and which compounds would each fraction contain? (d) How many of these fractions would be optically active? tod o ors brie page 10 of 17

S: What compound is 5-cyclopentyl-2- methylhexanal? (A) (B) (C) (D) 티 Ele H a H H H H

Using Newman projections, draw each of the following molecules it most stable staggered, least stable staggered, least stable eclipse and most stable eclipse conformations with respect to the bond indicated:(a) 4-ethyl-3-methylheptane, C3-C4(b) 4-isoproply-2,4,5-trimethylheptane, C4-C5(c) 6-isopropyl-2,5-dimethylnonane, C5-C6

Which of the following projections would show the second-highest energy conformation looking along the C1-C2 bond of 1-bromopropane? H H Br ,,. (B) (C) ମା (D) OA OB Oc OD OE H Ни 11 HH Br (E) H- H H H Hol,

could you identify C?

Name the following cycloalkenes: (c) CH(CH3)2 CH3 -CH3 (a) CH3 (b) CH3

help with #18

(A)Menthol, used to flavor various foods and tobacco, is the most stable stereoisomer of 2-isopropyl-5-methylcyclohexanol. Draw its most stable conformation. Is the hydroxyl group cis or trans to the isopropyl group? To the methyl group? (b) Neomenthol is a stereoisomer of menthol. That is, it has the same constitution but differs in the arrangement of its atoms in space. Neomenthol is the second most stable stereoisomer of 2-isopropyl-5methylcyclohexanol; it is less stable than menthol but more stable than any other stereoisomer. Write the structure of neomenthol in its most stable conformation.

9. For 3-fluoro-2-methylpentane, draw the Newman projection for the: (a) lowest energy conformation; (b) highest energy conformation, looking down the C-2 and C-3 bond length. You can use the following as shorthand: Me = methyl; Et = ethyl. (a) (b)