Table of Contents
Why does phenol not react with HBr?
In particular, the hydroxyl group is much more firmly attached to the benzene ring than to an alkyl group, so that replacement reactions of the entire -OH group by cleavage of the C-O bond do not occur with phenols. For example, phenol cannot be converted to bromobenzene with hydrogen bromide.
Can HBr react with phenol?
Like alkyl ethers, alkyl aryl ethers, R-O-Ar, are cleaved by the strong acids HI or HBr in a nucleophilic substitution reaction. The products are the phenol and the appropriate alkyl halide. Protonation of the ethereal oxygen creates a good leaving group, a neutral phenol molecule.
Why phenol does not react with nahco3 despite being acidic?
Sodium bicarbonate is a weak base . It easily accepts electrons from stronger acids like carbonic acid, but it is not strong enough to pull the proton off phenol. Hence, due to the weak acidic nature of phenol \[NaHC{O_3}\] does not react with phenol .
Why phenol does not react with nabr and h2so4?
Answers. Phenol will not react with mixture of them as it requires formation of phenyl cation which is very unstable…so no reaction occurs.
Which of the following will react most rapidly with HBr?
So, the tertiary alcohol reacts faster with hydrogen halide. 2-methyl propane-2-ol is tertiary alcohol and thus, reacts fastest with HBr.
Why phenol does not react with carbonates or bicarbonates although it is acidic in nature?
Phenol is acidic but does not react with sodium carbonate because it is weakly acidic and thereby do not have the strength to substitute or give away its H+ ions to that of weak bases like sodium carbonate.
Which compound does not react with phenol?
‘Phenol is an acid, but it does not react with sodium bicarbonate’.
Why doesn’t alcohol react with NaBr But when H2SO4 is added they form alkyl bromide?
Alcohols do no react with NaBr because is a very weak base and cannot displace the OH in the alcohols. On the other hand, when which is a strong acid is added, it leads to protonation of alcohols. When is lost or replaced, double bond appears and NaBr reacts with alkene to form alkyl bromides.
Which of the following compounds A and B will not react with a mixture or NaBr and h2s04 explain why?
Answer: A mixture of NaBr and H2SO4 gives Br2 gas as a product. Molecule (b) will not react with Br2 gas because of the stable molecule that is formed due to resonance stabilization.
Why peroxide effect is shown by HBr and not by HCl or hi?
Hydrocarbons. Why peroxide effect is shown only by HBr and not by HCl or HI? HCl is a very stable acid H-Cl bond (430 kJ moH) is stronger than H-Br bond (378 kJ mol-1) and is not broken symmetrically by the free radicals generated by peroxide. Hence the free radical addition of HCl to alkenes is not possible.