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Which of the following compounds is not chiral ?

(a) ${\mathrm{DCH}}_{2}{\mathrm{CH}}_{2}{\mathrm{CH}}_{2}\mathrm{Cl}$

(b) ${\mathrm{CH}}_{3}{\mathrm{CH}}_{2}\mathrm{CHDCl}$

(c) ${\mathrm{CH}}_{3}{\mathrm{CHDCH}}_{2}\mathrm{Cl}$

(d) ${\mathrm{CH}}_{3}{\mathrm{CHClCH}}_{2}\mathrm{D}$