Which one of the following compounds shows optical isomerism [MP PET 1

1.	Which one of the following compounds shows optical isomerism [MP PET 1990]
A.	\[C{{H}_{3}}CHCl-C{{H}_{2}}-C{{H}_{3}}\]
B.	\[C{{H}_{3}}-C{{H}_{2}}-CHCl-C{{H}_{2}}-C{{H}_{3}}\]
C.	\[ClC{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}\]
D.	\[ClC{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}\]
Answer» B. \[C{{H}_{3}}-C{{H}_{2}}-CHCl-C{{H}_{2}}-C{{H}_{3}}\]

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