Product (P) of the given reaction is CH_3-C↖\stackrel{O}{\parallel}-CH_2-COOC_2H_5 \stackrel{ { (I) }{ ─────▸} {NaH} \/ {THF}}_{(II)I_2} (A) \stackrel{H_3O^{+}{ ─────▸}\/\\Delta}(B) { ─────▸} (P) \stackrel{(NH_4)_2CO_3}{ ─────▸}_{\\Delta}

CH_3-C↖\stackrel{O}{\parallel}-CH_2-CH_2- C↖\stackrel{O}{\parallel}-CH_3

CH_3-C↖\stackrel{O}{\parallel}-{CH} _{|}_{COOH}-{CH} _{|}_{COOH} - C↖\stackrel{O}{\parallel}-CH_3