A) 1
B) 3
C) 4
D) 2
Correct Answer: D
Solution :
Key Idea: Optical isomerism is shown by compounds in which at least one asymmetric carbon atom and it should not have plane of symmetry. Tartaric acid has 2 asymmetric carbon atoms. Total no. of optical isomers \[={{(2)}^{n}}\] (where \[n=no.\]of asymmetric carbon atom). \[={{(2)}^{2}}=4\] Out of these 4 optical isomers two are meso structures which are optically in active. \[\therefore \]Only 2 structures d and \[l\] tartaric acid are optically active. \[\underset{d-\text{tartaric}\,\text{acid}}{\mathop{H-\underset{COOH}{\mathop{\underset{|}{\mathop{\underset{OH-C-H}{\overset{COOH}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,}}\,}}\,-OH}}\,\] \[\underset{l-\text{tartaric}\,\text{acid}}{\mathop{\underset{COOH}{\mathop{\underset{|}{\mathop{OH-\underset{H-C-OH}{\overset{COOH}{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,}}}\,-H}}\,}}\,}}\,\]
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