| List I - (Monomer) | List II - (Polymer) |
| (A) Tetrafluoroethene | (I) Orlon |
| (B) Acrylonitrile | (II) Natural rubber |
| (C) Caprolactam | (III) Teflon |
| (D) Isoprene | (IV) Nylon-6 |
Polymers are classified based on their monomer units and polymerization mechanism.
Match List-I with List-II: List-I
The correct increasing order of stability of the complexes based on \( \Delta \) value is:

In the given figure, the blocks $A$, $B$ and $C$ weigh $4\,\text{kg}$, $6\,\text{kg}$ and $8\,\text{kg}$ respectively. The coefficient of sliding friction between any two surfaces is $0.5$. The force $\vec{F}$ required to slide the block $C$ with constant speed is ___ N.
(Given: $g = 10\,\text{m s}^{-2}$) 
The equivalent resistance between the points \(A\) and \(B\) in the given circuit is \[ \frac{x}{5}\,\Omega. \] Find the value of \(x\). 
Method used for separation of mixture of products (B and C) obtained in the following reaction is: 