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Q. The most stable carbonium ion among these is:

JIPMERJIPMER 2002Organic Chemistry – Some Basic Principles and Techniques

Solution:

Due to more possibility for delocalisation of $\left( C _{6} H _{5}\right)_{2}- \overset {+}C - C _{6} H _{5}$ because of presence of $\pi-$ electrons in conjugation, $\left( C _{6} H _{5}\right)_{2}-\overset {+}{ C }- C _{6} H _{5}$ is the most stable ion.