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Chapter 1: Q1-22P (page 80)

For each pair of structures, determine whether they represent different compounds or a single compound.

a.

b.

c.

d.

Short Answer

Expert verified
  1. Different compounds
  2. Identical compounds
  3. Different compounds
  4. Identical compounds

Step by step solution

01

Configuration of compounds

Unsaturated compounds like alkenes that have restricted rotation due to C=C bond are geometrical isomers that is cis-trans or E/Z isomers.The compounds having opposite absolute configuration that is R and S are enantiomers (non-superimposable mirror images) while those having same absolute configuration are identical compounds.

02

Determining whether the compounds are different or same

(a)

The correct stereochemical descriptor for the compound is as follows:


Pair of structures

The stereochemical descriptors are different and hence these are different compounds (geometrical isomers).

b. The correct stereochemical descriptor for the compound is as follows:


Pair of structures

These two compounds are identical as bond connectivity is same and chiral centers are absent.

c.

The correct stereochemical descriptor for the compound is as follows:


Pair of structures

The stereochemical descriptors are different and hence these are different compounds (geometrical isomers).

d.

The correct stereochemical descriptor for the compound is as follows:

Pair of structures

The bond connectivity of all the atoms as well as the stereochemical descriptor remains the same. Hence, these compounds are same or identical.

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Most popular questions from this chapter

(a) Predict the hybridization of the oxygen atom in water H2O,. Draw a picture of its three-dimensional structure, and explain why its bond angle is 104.50.

(b) The electrostatic potential maps for ammonia and water are shown here. The structure of ammonia is shown within its EPM. Note how the lone pair creates a region of high electron potential (red), and the hydrogens are in regions of low electron potential (blue). Show how your three-dimensional structure of water corresponds with its EPM.

Use resonance structures to identify the areas of high and low electron density in the following compounds:

(a) H2C=CH-NO2

(b) H2C=CH-CN

(c)

(d)

(e)

(f)

Allene, CH2=C=CH2, has the structure shown below. Explain how the bonding in allene requires the two=CH2 groups at its ends to be at right angles to each other.

Allene

Question: Draw complete Lewis structures, including lone pairs, for the following compounds.

a.

b.

c.

d.

e.

f.

g.

h.

Question: Draw a line-angle formula for each compound in Problem.
See all solutions

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