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# Allotropes of oxygen are :

$(a)\;O_4\;and\;O_2\qquad(b)\;O_3\;and\; O_2\qquad(c)\;O_2\;and\;O_3\qquad(d)\;O\;and\;O_2$

Normal oxygen and ozone
(i.e) $O_2$ and $O_3$
Hence (c) is the correct answer.