Chp 3—Alkane structure & stereochemistry Flashcards
1
Q
alkane general formula
A
CnH2n+2
2
Q
alkane MP and BP affected by…
A
- size — larger molecule = higher BP, MP
- surface area — more surface area = higher BP, MP
- even/odd C number — even number = higher BP, MP
3
Q
Measure of plane angle between planes formed by 3 atoms in a conformer
A
dihedral angle φ
4
Q
eclipsed conformer
A
front and back atoms are aligned
5
Q
staggered conformer
A
front and back atoms are as far apart as possible
6
Q
staggered ethane dihedral angle =
A
60°
7
Q
angle/bayer strain
A
bond angle is forced to be less than the ideal tetrahedral bond angle
8
Q
energy of cyclohexane conformers in order
A
chair << twist boat << boat << half chair
9
Q
Can cis or trans decalin be chair-flipped?
A
Only cis
10
Q
A
