The specific chemical reaction sequence is missing from the provided text. However, in the context of the NEET 2024 exam, this question featured a multi-step sequence culminating in the Hoffmann bromamide degradation reaction. In that specific sequence, butanoic acid is typically converted into butanamide (a 4-carbon amide). When butanamide is treated with $Br_2$ and an aqueous or ethanolic solution of $NaOH$ (Hoffmann bromamide degradation), it yields propylamine ($CH_3CH_2CH_2NH_2$). This reaction is characteristic for producing a primary amine with one carbon atom less than the parent amide.