Explanation
The reaction of iodine and base with methyl ketones is so reliable that the "iodoform test" (the appearance of a yellow precipitate) is used to probe the presence of a methyl ketone. This is also the case when testing for secondary alcohols. Hence iodoform test gives negative result to phenols.
Benzyl bromide has the weakest carbon – halogen bond because benzyl cation left after the removal of the bromide ion is stabilized by resonance and also strength of C – Br is weaker than C – Cl bond.
Bromobenzene will not react with AgNO3 in the presence of HCl, because in bromobenzene, already halogen is present and which is directly attached to benzene ring. Hence reaction is not possible.
Benzyl chloride is an organic compound. It is colorless liquid and is reactive organochlorine compound , and gives white precipitation with AgNO3 followed by nucleo-philic substitution reaction.
SN1 reaction proceeds with the formation of carbocation intermediate which is favoured by the presence of Lewis acid and aprotic solvent.
During SN2 reaction of alkyl halide, inversion of configuration takesplace instead of rearrangement.
Reactivity order is
Benzyl > alkyl > (CH3)3 c → (CH3)2 CH → CH3 CH2 → CH3 ∴ (C6H5)2 C(CH3)2 > (C6H5)2CHBr > C6H5CH(CH3)Br >C6H5CH2Br
Hence (C6H5)2C(CH3)2 is more readily hydrolysed by SN1 mechanism
Halides reactivity increases in the order, Cl < Br < I.
Alkylmagnesium halides are called Grignard reagents.
Hence the order of reactivities of methyl halides in the formation of Grignard reagent is CH3I > CH3Br > CH3Cl .
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