Q. PARAGRAPH 2
Treatment of compound $O$ with $K M n O_{4} / H^{+}$ gave $P$ , which on heating with ammonia gave $Q$ . The compound $Q$ on treatment with $B r_{2} / N a O H$ produced $R$ . On strong heating, $Q$ gave $S$ , which on further treatment with ethyl 2 -bromopropanoate in the presence of KOH followed by acidification, gave a compound $T$ .

The compound $R$ is

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Solution:

Correct answer is (a)