In which of following carbocation rearragement take place with change

1.	In which of following carbocation rearragement take place with change carbon skeleton :
Answer» `CH_(3)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C-overset(o+)CH_(2)` `CH_(3)-CH_(2)-overset(o+)CH_(2)` `CH_(3)-underset(CH_(3))underset(\|)CH-CH_(2)-overset(o+)CH_(2)` `CH_(3)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C-CH_(2)-CH_(2)-overset(o+)CH_(2)` Solution :`underset(1^(underset(-)o)-"carbocation")(CH_(3)-underset(CH_(3))underset(\|)overset(CH_(3))overset(\|)C-overset(o+)CH_(2))overset("MIGRATION of -me GROUP")to underset(3^(underset(-)o)-"carbocation (more STABLE)")(CH_(3)-underset(o+)overset(CH_(3))overset(\|)C-CH_(2)-CH_(3))`

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