Riemer-Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below.
The electrophile in this reaction is :
Riemer-Tiemann reaction introduces an aldehyde group, on to the aromatic ring of phenol, ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below.
The structure of the intermediate I is
Match the reactions in Column I with nature of the reactions/type of the products in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 $$\times$$ 4 matrix given in the ORS.
| Column I | Column II | ||
|---|---|---|---|
| (A) | $$\mathrm{O_2^ - \to {O_2} + O_2^{2 - }}$$ | (P) | redox reaction |
| (B) | $$\mathrm{CrO_4^{2 - } + {H^ + }}$$ | (Q) | one of the products has trigonal planar structure |
| (C) | $$\mathrm{MnO_4^ - + NO_2^ - + {H^ + } \to}$$ | (R) | dimeric bridged tetrahedral metal ion |
| (D) | $$\mathrm{NO_3^ - + {H_2}S{O_4} + F{e^{2 + }} \to }$$ | (S) | disproportionation |
Match the compounds/ions in Column I with their properties/reactions in Column II. Indicate your answer by darkening the appropriate bubbles of the 4 $$\times$$ 4 matrix given in the ORS.
| Column I | Column II | ||
|---|---|---|---|
| (A) | $$\mathrm{C_6H_5CHO}$$ | (P) | gives precipitate with 2, 4-dinitrophenylhydrazine |
| (B) | $$\mathrm{CH_3C\equiv CH}$$ | (Q) | gives precipitate with $$\mathrm{AgNO_3}$$ |
| (C) | $$\mathrm{CN^-}$$ | (R) | is a nucleophile |
| (D) | $$\mathrm{I^-}$$ | (S) | is involved in cyanohydrin formation |
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