Phenols: acidity, electrophilic substitution, Reimer-Tiemann
- Given below are two statements :Statement I :The acidic strength of monosubstituted nitrophenol is higher than phenol because of electron withdrawing nitro group.Statement II :o-nitrophenol, m-nitrophenol and p-nitrophenol will have same acidic stren… Answer: 4. Statement I is correct but Statement II is incorrect. Key idea: the -NO₂ group is electron withdrawing and stabilises the phenoxi... 1
- The structure of intermediate A in the following reaction, is :[Reaction: cumene (isopropylbenzene) O_2 A [H_2O]H^+ phenol + acetone] Answer: 2. (2) cumene hydroperoxide: C6H5-C(CH3)2-O-O-H In the cumene process, cumene is oxidised by air at the benzylic tertiary C-H bond t... 1
- In the reaction[phenol + CHCl_3 + NaOH → sodium salicylaldehyde (o-O^-Na^+ C_6H_4 CHO), shown as a structure]the electrophile involved is Answer: 4. dichlorocarbene (:CCl ₂ ) This is the Reimer-Tiemann reaction. The electrophile is dichlorocarbene. The base removes a proton fro... 1
- Which one is the most acidic compound ? Answer: 3. [structure: 2,4,6-trinitrophenol] Key idea: electron-withdrawing groups stabilise the phenoxide ion and increase acidity. 2,4,6-T... 1
- Mixture of chloroxylenol and terpineol acts as : Answer: 1. antiseptic Key idea: a chloroxylenol and terpineol mixture is the well-known disinfectant Dettol. It is used on skin and wounds t... 1