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# Which one of the following is not having two chiral centres ?

(1) $H_3C - CH(Br) - CH(OH) - CH_3$

(2) $H_3C - CH(NH_2) - CH(Br) - CH_3$

(3) $H_3C - CH(NH_2) - CH(CI) - CH_3$

(4) $H_3C - CH(NH_2) - CH_2 - CH_3$