NEET Questions Solved


Which of the following acid does not exhibit optical isomerism?

(a) Maleic acid                             (b) α-amino acid

(c) Lactic acid                              (d) Tartaric acid                             

(a) Only those compounds exhibit optical isomerism, which have chiral centre and/or absence of symmetry elements. (Chiral carbon is the carbon in which all the four valencies are satisfied by four different groups.)

(a)                                             (b)    

  (c)   CH3C*H(OH)COOH                                       (d)  

         Lactic acid

(one chiral centre,

   so, optically acid)                    

                                                            

Thus, maleic acid does not exhibit optical isomerism.

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