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# Which one of the following exhibits enantiomerism ?

$\begin {array} {1 1} (1)\;BrCH_2-CH_2-CH_2-CH_2Br & \quad (2)\;H_3C-CH-CH_2-CH_3 \\ (3)\;H_3C-Ch_2-CH_2-CH_2Br & \quad (4)\;H_3C-CH_2-CBr_2-CH_3 \end {array}$

Can you answer this question?