Question

how to prepare bromopropane from butanoic acid

Answer 1

Form the silver salt of butanoic acid, treat it with bromine in some suitable solvent like carbon tetrachloride. In the case of bromopropane specifically, it might be worth doing a literature review to see what other solvents can be used, because the boiling points of your product and carbon tetrachloride are close enough together that separation might require some trickery.

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Answer 2

Look in the attachment down