JEE Advanced 2016 Paper 2

Next 2 questions are based on the paragraph Treatment of compound O with KMnO$_4$ / H$^{+}$ gave P, which on heating with ammonia gave Q. The compound Q on treatment with Br$_2$/NaOH produced R. On strong heating,Q gave S, which on further treatment with ethyl 2-bromopropanoate in the presence of KOH following by acidification,gave a compound T.