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Q.
The correct order of stability of carbocations, is:
JIPMERJIPMER 2004Organic Chemistry – Some Basic Principles and Techniques
Solution:
More the +I alkyl groups on electron deficient carbon, more stable will be the cabocation. Hence, $3^{\circ}$ carbocations are more stable.
The correct order is $3^{\circ} > 2^{\circ} > 1^{\circ} > \overset{+}{C}H _{3}$