What are biochemical catalysts called?

State the valency of each carbon atom in $(i)$ an alkane and $(ii)$ an alkyne.

Select alkenes and alkynes from the following:
$C_{2}H_{4}, C_{3}H_{4}, C_{2}H_{2}, C_{4}H_{8}$

Unsaturated hydrocarbons produce a yellow flame with a large amount of black smoke when burnt in oxygen. Give the reason.

In electron dot structure,the valence shell electrons are represented by crosses or dots.
$(a)$ The atomic number of chlorine is $17$. Write its electronic configuration.
$(b)$ Draw the electron dot structure of chlorine molecule $(Cl_2)$.

Which catalyst is used in the Fischer-Tropsch process to synthesize hydrocarbons or oxygenated compounds like propanone?