In which of the following molecules carbon atom marked with an asterisk (*) is asymmetric?
(i) (a), (b), (c), (d)
(ii) (a), (b), (c)
(iii) (b), (c), (d)
(iv) (a), (c), (d)
(ii) An Asymmetric carbon atom has linked with four different groups or atoms with all of its four valencies. Here, the carbon atoms of (i), (ii), and (iii), all have linked with four different groups of atoms. Hence, those are asymmetric. Whereas, in (iv), the carbon atom linked with two of its valencies with two similar hydrogen atoms. Therefore, it is not an asymmetric carbon atom.