he chemical structure

Which statement about the following dibromodimethylcyclohexane structure is false? Br Br O a. The two methyl groups are in a gauche relationship. Ob. There is 1,3-diaxial strain present. Oc. The two bromine atoms are cis to each other. d. This compound is not optically active. e. There are 2 axial bromines present.

4. Syn and anti addition can occur with alkenes. 1. Describe syn and anti addition. b. Give an example of syn addition to an alkene and explain why it is syn. c. Give an example of anti addition to an alkene and explain why it is anti. 5. The following reactions shows the dehydration of 2-methylcyclohexanol. Why is 1-methylcyclohexene the major product? X OH H3PO4 84% 16%

Br KOH / DMSO 6. b. 2-methyl-1-propanol d. 1,2- a. 2-methylpropene propanediene c. no reaction e. something else! 7. cyclopentanol + NaH + DMSO+ bromopropane à(major product) a. cyclopentene reaction b. propene c. propyl cyclopentyl ether d. no e. something else!! 8. 2-bromo-3-methylbutane + KOH / DMSO à(major product) a. 2-methyl-1-butene d. no reaction b. 2-methyl-2-butene c. 3-methyl-2-butanol e. something else!! 9. 2-chloro-3-methylbutane + KI / DMSO à(major product) a. 2-methyl-1-butene b. 2-methyl-2-butene c. 3-methyl-2-iodobutane d. no rxn e. something else!! 10. (S)-2-iodobutane + NaN; / DMF à (major product) N3 c. f. something else!! а. b. с. d. е. no rxn 11. cyclohexene + NBS/ CCl, / light followed by K* t-butoxide / t-butanol with heating à a. cyclohexene b. 1,3-cyclohexadiene cyclohexane e. something else! c. 1,2-cyclohexadiene d.