Two aliphatic aldehydes $\mathbf{P}$ and $\mathbf{Q}$ react in the presence of aqueous $\mathrm{K}_2 \mathrm{CO}_3$ to give compound $\mathbf{R}$, which upon treatment with HCN provides compound $\mathbf{S}$. On acidification and heating, $\mathbf{S}$ gives the product shown below :
Two aliphatic aldehydes $\mathbf{P}$ and $\mathbf{Q}$ react in the presence of aqueous $\mathrm{K}_2 \mathrm{CO}_3$ to give compound $\mathbf{R}$, which upon treatment with HCN provides compound $\mathbf{S}$. On acidification and heating, $\mathbf{S}$ gives the product shown below :
| Column I | Column II |
|---|---|
(A) 
|
(P) Racemic mixture |
(B) 
|
(Q) Addition reaction |
(C) 
|
(R) Substitution reaction |
(D) 
|
(S) Coupling reaction |
All the compounds listed in Column I react with water. Match the result of the respective reactions with the appropriate options listed in Column II.
| Column I | Column II |
|---|---|
| (A) (CH3)2SiCl2 | (P) Hydrogen halide formation |
| (B) XeF4 | (Q) Redox reaction |
| (C) Cl2 | (R) Reacts with glass |
| (D) VCl5 | (S) Polymerisation |
| (T) O2 formation |
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