Question
show the mechanism responsible for the formation of compound 4.
NO НО НО. NaNO2 HCI (1 М, aq)
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Answer: Formation of Compound 4 Mechenisur rolde че про Ио. HONCR и0 Hech Kawo, to o + 1,0 + къса О. POSA CON А В т. б (3) Re

The mechanism follows is electrophilic substitution reaction where NO+ (electrophile ) replace H+

step1 is an electrophile generation step in which NaNO2 react with HCl to form NO+ ( Elctrophile )

Step 2 is the substitution step where NO+ replace H+, the rection goes through a carbocation formation step, where carbocation is stabilized by the resonance of the benzene double bond.

I hope you understand the Mechanism. let e know i you have any doubt

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