Question

how to convert prop-1-ene to fluropropane

Answer 1

React prop-1-ene with HBr to form 1-bromopropane.

React 1-bromopropane with AgF to form fluoropropane (swarts reaction)

Answer 2

Explanation:

Treat the prop-1-ene with Hydrogen bromide in the presence of peroxide.

$CH_3-CH=CH_2+HBr\overset{Peroxide}\rightarrow CH_3-CH_2-CH_2Br$

Now treat the propane bromide with antimony trifluoride to obtain fluoropropane.

$CH_3-CH_2-CH_2Br+SbF_3\rightarrow CH_3-CH_2-CH_2F$