The general order for stability or carbocations is
Tertiary > Secondary > Primary >
> Primary > Secondary > Tertiary
Primary > > Secondary > Tertiary
Tertiary > Secondary > > Primary
In general, as the number of alkyl groups attached to the carbocation increases, the stability of the carbocation also increases.
Hence, the correct order of stability of the carbocations is
Tertiary > Secondary > Primary >
Therefore, the correct answer is Option (1).
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