A) 8
B) 12
C) 16
D) 4
Correct Answer: A
Solution :
The structural formula of 2, 3, 4-trichloro pentanoic acid is given below. \[\underset{C{{H}_{3}}}{\overset{O}{\mathop{\underset{|}{\overset{|\,|}{\mathop{\underset{H-\,\,\,\,{{C}^{\,*}}-\,\,Cl}{\mathop{\underset{|}{\mathop{\underset{H-\,\,\,\,{{C}^{\,*}}-\,\,Cl}{\mathop{\underset{|}{\mathop{\underset{H-\,\,\,\,\,C{{\,}^{*}}-\,\,Cl}{\mathop{\underset{|}{\mathop{C}}\,}}\,}}\,}}\,}}\,}}\,}}}\,}}}\,-OH\] Number of optical active isomers\[={{2}^{n}}\]where, n = number of asymmetric carbon atom. 2, 3, 4-trichloropentanoic acid has three asymmetric carbon atoms. So, number of optical active isomers\[={{2}^{3}}\] \[\therefore \]Number of optical active isomers = 8
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