Question

Which of the following will have a meso isomer also?
This question has multiple correct options.
A. \[Cis-1,2\] dichlorocyclobutane
B. \[2,3-\] dichlorobutane
C. \[2,2-\] dichlorobutane
D. \[2,3-\] dimethylbutane

Answer 1

Hint: The meso isomers are optically inactive. Meso compounds are symmetrical in nature. isomerism is a phenomenon in which isomers are the different compounds having the same molecular structure. Stereochemistry deals with the arrangement of atoms and molecules.

Complete step by step answer:
Meso isomer is defined as a compound whose molecule is superimposable on the mirror images in the presence of chiral carbon. Cis \[-1,2\] dichlorocyclobutane and \[2,3-\] dichlorobutane contains plane of symmetry.

\[2,2-\] dichlorobutane and \[2,3-\] dimethylbutane does not contain plane of symmetry and hence it is chiral in nature

So, the correct answer is Option A,B.

Additional information:
Chiral carbon is defined as a carbon atom that is attached to four different types of atoms or groups.
Meso isomer is an optically inactive isomer that contains superimposable mirror images, at least two of which are optically active, that means, in spite of containing two or more stereogenic centers, the molecule is not chiral.
Meso compounds are the symmetric compounds.
Meso compounds are achiral. When a polarized light passes through an achiral compound, there will be no net rotation of polarized light. Therefore, achiral are optically inactive.
Stereochemistry is a branch of chemistry that works on the three – dimensional arrangement of atoms and molecules.
Isomers are known as the different compounds having the same molecular structure and this phenomenon is known as isomerism.

Note: Chiral molecules have four different atoms having $s{{p}^{3}}$ hybridization.
Chiral compounds can rotate light.
Meso compounds are superimposable mirror images and are rotated $180{}^\circ $ .