Pls kindly provide me with encircled boxes as primary ,secondary and tertiary carbocation and explain brief about it stability suppose benzylic carbocation ,allylic carbocation are present with this explain stability pls in a clear way

The stability of carbocation is benzylic carbon > allylic carbon > tertiary > secondary > primary.
The reason is benzyl carbocations are more resonance stabilised than allyl.
Tertiary carbocations have three +I alkyl group which stabilises the carbocation more than the secondary which has only two which in turn is more than the primary as it has only one carbocation.
 

For the question given the answer given by â€‹Nimish Jain is correct
 

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answer is (4)

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How did yu say second structure that as tertiary it appear to be secondary Ch+
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It is tertiary there are 3 carbon chain to which it is attached
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I cannot understand or post the image to show me what yu are talking about
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What are you looking for?