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NOMENCLATURE AND CONFORMATIONS OF ALKANES AND CYCLOALKANES 63
4.5 How many isomers are possible for C3H7Br?
(a) 1 (b) 2 (c) 3 (d) 4 (e) 5
4.6 Which isomer of 1,3-dimethylcyclohexane is more stable?
(a) cis (b) trans (c) Both are equally stable (d) Impossible to tell
4.7 Which is the lowest energy conformation of trans-1,4-dimethylcyclohexane?
(a)
H
H
CH3CH3 (b)
HH
CH3
CH3
(c)
H
CH3
CH3H (d) H
H
CH3
CH3
(e) More than one of the above
4.8 Supply the missing structures
(a)
Cl
Cl
ring flip
(b)
2-Bromobicyclo[2.2.1]heptane
(c) Newman projection for a gauche form of 1,2-dibromoethane