1.

In which of the followingcombination of reagents precipitate is not formed.

Answer»

`Mn^(2+)(aq).+H_(2)O_(2)+NH_(3)" solution"`
`Al^(3+)(aq).+(NH_(4))_(2)S`
`Cr^(3+)(aq).+H_(2)O_(2)+NaOH" solution"`
`Fe^(2+)(aq).+Na_(2)O_(2)`

Solution :HBr In dark follows markovnikov's addition (ELECTROPHILIC addition) HBr in the presence of peroxide goes for anti-markovnikkov's product without any rearrangement.
HI follows markovnikov's addition in the presence or ABSENCE of peroxide.


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