Question

The Newman Projections below all represent 2,3,3-trimethylhexane. Use them to answer the following four questions HTH H HT H VI VII VIII 20. Which Newman Projection represents the most stable conformation of 23,3-trimethylhexane looking down the 3-4 C-C bond? a VIII d. III b. I e. IV c. VII 21. Of the options below, which represents the “gauche” conformation of 2,3,3-trimethylhexane down the 2-3 C-C bond? a. II 6. b. V d. I 22. Which answer choice correctly orders the Newman projections from most to least stable? a. b. c. V > VI >I>II VI>V >II>I I>II>V > VI d. e. II>I> VI > V I>V >II>VI 23. Which projection represents the highest energy conformation of 2,3,3-trimethylhexane looking down the 2-3 C-C bond? a VII d. II b. V e. I C. VÌ

Answer 1

20) option e that is (|v) is most stable because isopropyl and ethyl are anti to each other that is far from each other.

21) {||}represent the gauche form because both methyl group are in side of propyl group

22)correct option is c eclipse form are less stable than gauche and anti form

23) (vi) because it is least stable due to eclipsed form and hence highest energy