What type of reaction is this and what is the product?

Question

c) 1-chlorobutane reacts + sodium hydroxide solution -->

addition, substitution, elimination etc.

Answer 1

Since 1-chlorobutane is not unsaturated, you can rule out an addition reaction. To decide between substitution and elimination, ask yourself (or research) whether hydroxide is a strong enough base to remove a proton from 1-chlorobutane, or a strong enough nucleophile to replace the chloride.