acid

HVZ reaction is only given by aliphatic acids with alpha hydrogen atoms!!!!!

it depends on the stability of the acyl bromide and the stability of the final product of hvz reaction.

Bcos in HVZ reaction we have keto-enol tautomerism so the factors which increases the stability of the keto form so we will get it as a major product

Okay.Thanks.Cud u pls give the mechanism or tell where i cud get it coz in Morrison Boyd/R.K.Gupta detailed mechanism with keto-enol tautomerism is not given.pls help....

you refer to s.n.sanyal's or mukul c.ray's books for the detailed mechanism! actually what differentiates the two reactions is the use of _{traces of phosphorus in the HVZ REACTION!}

yeah,that was given in Morrison Boyd.but,does it depend on relative stability of keto-enol form or amt of phosphorus?ne wez,thanks!

actually, as the mech. wud suggest, there IS a formation of

R-cO-Br in the process., 99% of the times when he says Br2 and P wid acid he wants u to do HVZ only.

cheers!!