Question

Which acid does not show optical isomerism?

Answer 1

In order to answer this question, to know the name of acid which does not show optical isomerism, we will first mention the required acid name and then we will discuss the reason behind why the particular acid does not show optical isomerism. And then we will discuss much more about that acid type.

Complete answer:
Maleic acid does not show optical isomerism. This is due to the fact that maleic acid does not have a chiral centre and does not lack symmetry elements.
Only those compounds with a chiral centre and/or no symmetry elements display optical isomerism. (The four valencies of chiral carbon are satisfied by four distinct groups.) As a result, there is no optical isomerism in maleic acid.
Maleic acid, also known as cis-butenedioic acid, is a dicarboxylic acid, or molecule with two carboxyl groups. $H{O_2}CCH = CHC{O_2}H$ is its chemical formula. The cis-isomer of butenedioic acid is maleic acid, whereas the trans-isomer is fumaric acid. Maleic acid is mostly utilised as a precursor to fumaric acid, and it has few applications compared to its parent maleic anhydride.
Maleic acid is created in industry by hydrolysis of maleic anhydride, which is created by oxidation of benzene or butane. Maleic acid is an industrial raw material used in the ozonolysis process to produce glyoxylic acid. Maleic acid, such as indacaterol maleate, can be used to build acid addition salts with medications to make them more stable.
Maleic acid is also utilised in methyl methacrylate-based adhesives as an adhesion booster for various substrates, such as nylon and zinc-coated metals, such as galvanised steel.

Note:
Because of their effect on plane polarised light, optical isomers are given this term. Enantiomers are two isomers of simple compounds that demonstrate optical isomerism. The plane of polarisation spins clockwise when one enantiomer is present in a solution. This enantiomer is known as the $( + )$ form.