CH Br Br H3C O They are geometric isomers. Correct Answer: They are identical. They are diastereomers O They are enantiomers O They are identical. O They are stereoisomers without a stereogenic center es ctional Dr. Ro nebu Rleck
![What are the correct IUPAC names, left to right, for the ring systems shown? (The choices are
given in the same order as the molecules are depicted, from left to right.)
O bicyclo[4.3.21]undecane – spiro[5.4]decane - bicyclo[5.2.0]nonane
O bicyclo[4.3.2]dodecane – spiro[4.5]decane – bicyclo[5.2.0]nonane
O bicyclo[4.5.6]undecane – spiro[6.5.1]decane – bicyclo[7.4.2]nonane
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O bicyclo[2.3.4]undecane – spiro[4.5]decane - bicyclo[7.4]nonane
bicyclo[6.5.4]dodecane – spiro[5.6.0]decane
bicyclo[5.2.0]nonane
bicyclo[4.3.2]dodecane - spiro[4.5]decane -
bicyclo[5.2.0]nonane
Correct
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Geometric isomer:
Cis–trans isomerism, also known as geometric isomerism or configurational isomerism, is a term used in organic chemistry. The prefixes "cis" and "trans" are from Latin: "this side of" and "the other side of", respectively. In the context of chemistry, cis indicates that the functional groups are on the same side of the carbon chain while trans conveys that functional groups are on opposing sides of the carbon chain. Cis-trans isomers are stereoisomers, that is, pairs of molecules which have the same formula but whose functional groups are rotated into a different orientation in three-dimensional space. It is not to be confused with E–Z isomerism, which is an absolute stereochemical description. In general, stereoisomers contain double bonds that do not rotate, or they may contain ring structures, where the rotation of bonds is restricted or prevented.[2] Cis and trans isomers occur both in organic molecules and in inorganic coordination complexes. Cis and trans descriptors are not used for cases of conformational isomerism where the two geometric forms easily interconvert, such as most open-chain single-bonded structures; instead, the terms "syn" and "anti" are used.
Clearly the word dia in diastereomer means two. So, Stereoisomers with two or more stereocenters can be diastereomers.
Diastereomers are stereoisomers that are not mirror images of one another and are non-superimposable on one another.
A stereogenic center is any atom that gives different isomers when atoms or groups attached to it are exchanged. These isomers are called stereoisomers because the structures of the molecules are the same but their spatial arrangements are different from each other.
Clearly,this molecule does not has any fixed bond like double bond or ring structure. So, it is neither Geometric/stereoisomer which means it doesn't has a stereogenic center nor Diastereo isomers.
Hence option A,B and E get rejected.
Enantiomers are chiral molecules that are mirror images of one another. Furthermore, the molecules are non-superimposable on one another. This means that the molecules cannot be placed on top of one another and give the same molecule. Chiral molecules with one or more stereocenters can be enantiomers.
The last carbon atom on which 4 group are shown is chiral but both structures are not mirror images of each other. Hence, these are not even enantiomers.
So, the correct option is that both are identical.
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