Hydrocarbons

Explanation:

Step 1: The compounds that have the same number of and same type of atoms but differ from each other in their spatial arrangement of atoms are the geometrical isomers of each other.

The conditions for geometrical isomers are as follows:

(i) The molecule of the given compound must have a double bond.
(ii) Different atoms or groups of atoms must be attached on each side of the carbon-carbon double bond.

Generally, the compound with YXC = CXY like structure shows geometrical isomerism.

Step 2: The structure of the given compounds is as follows:

Among, the given compounds, only 4-Methylpent-2-ene will show geometrical isomerism. Hence, option 2 is the correct answer.

Hint: A is an alkene

In the first reaction, when vicinal dibromide reacts with Zn then alkene is obtained as a product. In the next step, alkene reacts with diborane followed by basic hydrogen peroxide give alcohol as a product. 

The reaction is known as the Hydroboration Oxidation reaction. The reaction follows the Anti-Markovnikov rule. The reaction is as follows:

Hence, option third is the correct answer.