Given the following energies in kcal/moles (CH_3/CH_3 eclipsed = 4.1, CH_3/H ecl

Question

Given the following energies in kcal/moles (CH_3/CH_3 eclipsed = 4.1, CH_3/H eclipsed = 1.2, H/H eclipsed = 1. CH_3/CH_3 gauche = 0.8), to the nearest 0.1 of a kcal/mole what is the energy difference between the following Wedge-Slash representations. a. 0.8 b. 5.5 c. 6.3 d. 7.1 e. nota.-d. What is the systematic name of the following compound? a. 7-ethyl-3-(1-methylethyl)-5-(1-methylpropyl)nonane b. 3-ethyl-7-(1-methylethyl)-5-(1-methylpropyl)nonane c. 3, 7-diethyl-8-methyl-5-(1-methylpropyl)nonane d. 3, 7-diethyl-2-methyl-5-(1-methylpropyl)nonane e. not a.-d. Which compound is a diastereomer of a trans compound? Cycloheptane has the least of which type of strain? a. angle b. face c.tortional d.nota.-c.

Explanation / Answer

17) The given structures are having same repulsions as they have same type of arrangement of CH3 groups. But positions of the CH3 groups interchanged on one carbon but the repulsions are same, so there is no energy difference between these two structures.

Answer: e) no a-d

18) Systematic name of the compound

3,7-diethyl-3-methyl-5-(2-methylpropyl)nonane

This name is not in options.

19) Answer: b)

20) Cyclopentane has low angle strain

Answer: a)

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