Optically active compounds among the following is

1.	Optically active compounds among the following is
Answer» `CH_(3)-CH_(2)-CHCl-CH_(2)-CH_(3)` `CH_(3)-CH_(2)-CDCl-CH_(2)-CH_(3)` `CH_(3)-CH_(2)-CHD-CH_(2)-CH_(3)` `CH_(3)-CH_(2)-CHD-CH_(3)` SOLUTION : Due to the PRESENCE of chiral centre it is optically active

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