Question
Asked Feb 19, 2020
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Are the following pairs identical, enantiomers, diastereomers, or constitutional isomers?

CI
and
CI
CI
CH3
a.
and
CH3
CI
CH3
CH3
CI
and
CI
.CI
b.
d.
and
CH3
CH3
CH3
CH3
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CI and CI CI CH3 a. and CH3 CI CH3 CH3 CI and CI .CI b. d. and CH3 CH3 CH3 CH3

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Expert Answer

Introduction

“Since you have posted a question with multiple sub-parts, we will solve first three subparts for you. To get remaining sub-part solved please repost the complete question and mention the sub-parts to be solved.”

If two molecules possess identical "molecular formula" along with same "connectivity of groups" as well as same "orientation" then they are identical.

"Enantiomers and Diastereomers" are stereoisomers. They possess different orientation and connectivity of groups. The mirror image of enantiomers is "superimposable".  "Diastereomers" do not have mirror images.

 

Explanation

Option a.

Chemistry homework question answer, step 2, image 1Chemistry homework question answer, step 2, image 2

          (i)                                    (ii)

In structure (i), the compound is having configuration  RS  whereas, in structure (ii), the configuration is RR. Both these compounds will form a non-superimposable mirror image.

Hence, both the structures are "diastereomers".

Explanation

Option b.

Chemistry homework question answer, step 3, image 1Chemistry homework question answer, step 3, image 2

          (i)                                          (i)

In structure (i), the compound is having configuration  RS  whereas, in structure (ii), the configuration is SR. Both these compounds will form a superimposable mirror image.

Hence, both the structures are "Enantiomers".

...

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