Compound$(s)$ that on hydrogenation produce$(s)$ optically inactive compound$(s)$ is (are)

In hydroboration-oxidation reaction $:-$
$I$. Syn addition takes place
$II$. Reaction proceeds through the formation of a cyclic transition state
$III$. Vicinal diol is obtained as a product
$IV$. Anti-addition takes place and Anti-Markovnikov rule is followed
Which of the following statement$(s)$ is/are correct $:-$

Addition of $HI$ on the double bond of propene yields isopropyl iodide and not $n$-propyl iodide as the major product. This is because the addition proceeds through

An alkene $(X)$ on ozonolysis gives propanal and ethanal. What is $X$?

Describe the physical properties of alkenes.

What will be the product in the following reaction?
(Image of methylenecyclohexane reacting with $NBS$)