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Hello students, in this question we have to characterize different molecules into chiral, achiral or achiral and meso.
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In the first compound we can see that there are two chiral center.
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However, there is a plane of symmetry present in this molecule.
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Hence, this will become achiral and meso.
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In the next molecule we can see that there are two asymmetric centers.
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Hence, this molecule will be chiral.
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Also, there is no plane of symmetry present in this molecule.
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So, we can say that this molecule will be chiral.
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Now, let's look at the next molecule.
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This molecule has no asymmetric center because these two groups will be same.
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So, that is why this will be achiral.
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In the next molecule we can see that we have two asymmetric centers.
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However, these two groups will be same.
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So, they will not act as an asymmetric center.
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Hence, this molecule will also be achiral.
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In the next molecule we can see that we have two asymmetric centers.
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However, there will be a center of symmetry present in this molecule which will make this compound achiral and meso.
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Meso compounds are those compound which contains multiple asymmetric centers but due to the presence of plane or center of symmetry they are optically inactive...