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Chapter 3: Q43P (page 88)

The bond angles in a regular polygon with nsides are equal to
180o-360on

a. What are the bond angles in a regular octagon?

b. What are the bond angles in a regular nonagon?

Short Answer

Expert verified

a. For octagon, n = 8 and therefore the bond angle is 135鈭�.

b. For nonagon, n = 9 and therefore the bond angle is 140鈭�.

Step by step solution

01

Explanation of formula

This formula is known as the Baeyer formula which basically calculates the angle of a particular molecule. All the carbons in cyclic rings like propane-butane are formed with sp3 carbon which has a known angle of 109.5掳, but those cyclic rings don鈥檛 have this angle in their structure and with increasing the no of the carbon atom, the angle strain decreases but after 5 carbon atoms, the angle again increases and as well as angle strain.

n in this formula is the number of carbon atoms in a compound.

02

Subpart (a) The bond angle in a regular octagon.

For octagon, n = 8

Therefore, the bond angle is

=180o-360on=180o-360o8=180o-45o=135o

03

Subpart (b) The bond angle in a regular nonagon.

For nonagon, n = 9

Therefore, the bond angle is

=180o-360on=180o-360o9=180o-40鈭�=140鈭�

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Most popular questions from this chapter

  1. Draw all the staggered and eclipsed conformers that result from rotation about the C-2_ C-3bond of pentane.
  2. Draw a potential-energy diagram for rotation about the C-2_C-3bond of pentane through 3600, starting with the least stable conformer.

Draw the most stable conformer of the following molecule. (A solid wedge points out of the plane of the paper toward the viewer. A hatched wedge points back from the plane of the paper away from the viewer.)

Which has

a. the higher boiling point: 1-bromopentane or 1-bromohexane?

b. the higher boiling point: pentyl chloride or isopentyl chloride?

c. the greater solubility in water: 1-butanol or 1-pentanol?

d. the higher boiling point: 1-hexanol or 1-methoxypentane?

e. the higher melting point: hexane or isohexane?

f. the higher boiling point: 1-chloropentane or 1-pentanol?

g. the higher boiling point: 1-bromopentane or 1-chloropentane?

h. the higher boiling point: diethyl ether or butyl alcohol?

i. the greater density: heptane or octane?

j. the higher boiling point: isopentyl alcohol or isopentylamine?

k. the higher boiling point: hexylamine or dipropylamine?

What is the smallest straight-chain alkane that is a liquid at room temperature (which is about 25 掳C)?

Draw the two chair conformers for each of the following and indicate which conformer is more stable:

a. cis-1-ethyl-3-methylcyclohexane

b. trans-1-ethyl-2-methylcyclohexane

c. trans-1-ethyl-2-isopropylcyclohexane

d. cis-1,2-diethylcyclohexane

e. cis-1-ethyl-3-isopropylcyclohexane

f. cis-1-ethyl-4-isopropylcyclohexane
See all solutions

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