Write the type of the reaction in each of the following cases. (I) CH 2 = CH 2 → H 3 O + CH 3 CH 2 OH (II) CH 3 - CH 2 - Br → NaOH CH 3 - CH 2 OH (III) (IV) (V) (VI) (VII) (VIII)

A reaction in which one molecule combines with another to form a larger molecule with no other products is called addition reaction. Substitution reaction, any of a class of chemical reactions in which an atom, ion, or group of atoms or ions in a molecule is replaced by another atom, ion, or group. A reaction in which two groups remove and form unsaturated compound or a reaction in which two sigma 1 bonds are converts into one pi bond is called elimination reaction. Reaction (i) is the addition reaction, i.e., hydration reaction. Reaction (ii) is the nucleophilic substitution reaction. Here, the hydroxide group replaces the bromine atom. Reaction (iii) is the elimination reaction. This is also called a dehydrohalogenation reaction. Reaction (iv) is also the elimination reaction. This is also called a dehydrohalogenation reaction. Reaction (v) is also the elimination reaction. This is also called a dehydrohalogenation reaction. Reaction (vi) is also the elimination reaction. This is also called a dehydration reaction. Reaction (vii) is the nucleophilic substitution reaction. Here, the hydroxide group is replaced by a chlorine atom. Reaction (viii) is the nucleophilic substitution reaction. Here, the hydroxide group is replaced by an iodine atom.