1.

H_(3)C-underset(CH_(3))underset("|")(CH)-CH=CH_(2)+HBrrarrA A (predominantly) is :

Answer»

`CH_(3)-underset(CH_(3))underset(|)overset(Br)overset(|)(C)-CH_(2)CH_(3)`
`CH_(3)-underset(Br)underset(|)(CH)-underset(CH_(3))underset(|)(CH)-CH_(3)`
`CH_(3)-underset(CH_(3))underset(|)(CH)-underset(Br)underset(|)(CH)-CH_(3)`
`CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(2)Br`

Solution :`CH_(3)underset(CH_(3))underset("|")(CH)-CH=CH_(2)+HBroverset(-Br^(-))rarrCH_(3)-underset((2^(@)-"CARBOCATION"))underset(CH_(3))underset(|)(CH)-overset(+)(C)H-CH_(3)underset("shif")overset("1,2-hydride")rarrCH_(3)underset(3^(@)"Carbocation (more stable)")underset(CH_(3))underset(|)overset(+)(C)-CH_(2)-CH_(3)overset(+Br^(-))rarrCH_(3)-underset(CH_(3))underset(|)overset(Br)overset(|)(C)-CH_(2)-CH_(3)`


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