Shapes 2 lecture 3

Question 1

syn peri-planar

Answer 1

0c . eclipsed.
Me groups are facing upwards

Question 2

gauche / synclincal

Answer 2

60
staggered

Question 3

anticlinal

Answer 3

eclipsed
120
Me is next to H

Question 4

antiperiplanar

Answer 4

staggered
Me are opposite sides
180

Question 5

The anti-periplanar conformation, with the two methyl groups opposite each other, is

Answer 5

the most stable of all.

Question 6

the eclipsed conformations

Answer 6

are not stable since any rotation leads to a more stable conformation.

Question 7

why does eclipse conformation have an higher energy than staggered ?

Answer 7

electrons in bond repel each other
this replusion is highest at eclipsed conformation

Question 8

what helps to reduce the energy of staggered conformations?

Answer 8

anti sigma bonds and sigma bonds stabilize each other on different Carbons. This if the carbons are parerrel then it is more likely to have stabilize

Question 9

why does antibonding orbital stabilize the bond

Answer 9

bonding orbital donates electrons to anti bonding, This reduces the replusive effect

Question 10

interconverting

Answer 10

changing

Question 11

all internal angles of a cyclo is

Answer 11

may difffer form the expect 109.5 due to ring strains

Question 12

comparing the heat of combustion with the value measured for the straight chain molecule

Answer 12

can determine the stability of the ring

Question 13

more energy in bond strain means

Answer 13

more energy is released in combustion

Question 14

closeness in rings

Answer 14

When atoms are close together, their proximity is highly unfavorable and causes steric hindrance.

Question 15

bonds are

Answer 15

disorted in rings

Question 16

gauche interaction

Answer 16

The gauche interaction is a steric interaction that results between two groups on the adjacent carbon atoms in a Newman projection.