Question

Assign A, B, C, D from a given type of reaction.
A.for disproportionation reaction.
B.for comproportionation reaction.
C.for either intermolecular redox reaction or displacement reaction.
D.for either thermal combination redox reaction or thermal redox reaction.
$Sn + PC{l_5}\xrightarrow{\Delta }SnC{l_4} + PC{l_3}$

Answer 1

In the question reaction is given, just observe the reaction and write what type of reaction it is. Calculate the oxidation first it will give you an idea of what reduction and oxidation are happening. And likewise, identify the reaction carefully and choose the correct option.

Complete answer:
In the above question, we are given the reaction and we have to tell which type of reaction it is from the above-given options of A, B, C, D.
The reaction given to us is: $Sn + PC{l_5}\xrightarrow{\Delta }SnC{l_4} + PC{l_3}$
This reaction is either an intermolecular redox reaction or a displacement reaction.
Intermolecular redox reactions are those in which oxidation and reduction take place when molecules of two different substances react with each other. This means that the oxidant and the reductant part are of a different molecule.
In our reaction $Sn + PC{l_5}\xrightarrow{\Delta }SnC{l_4} + PC{l_3}$, the oxidation states are as follows:
$\mathop {Sn}\limits^0 + \mathop P\limits^{ + 5} C{l_5}\xrightarrow{\Delta }\mathop {Sn}\limits^{ + 4} C{l_4} + \mathop P\limits^{ + 3} C{l_3}$
In the above reaction it can be seen that $Sn$ is undergoing oxidation from $0$ to $+ 4$ and $P$ is undergoing reduction from $+ 5$ to $+ 3$. So we can say that oxidant and reductant are part of different molecules. Hence this is an intermolecular redox reaction.
Displacement reactions are those in which one reactant displaces the other reactant. In the above reaction $Sn + PC{l_5}\xrightarrow{\Delta }SnC{l_4} + PC{l_3}$, $Sn$ is displacing $PC{l_5}$ so there is displacement taking place here.
Therefore this reaction is either an intermolecular or displacement reaction.
Hence C is the correct option.

Note:
For such problems observing the reactions is very important. The above reaction can be confused with option D because redox reaction is taking place but only redox reaction is occurring there is no combination reaction taking place here. However, there is the involvement of heat in the reaction.