In an SN1 reaction, why does a tertiary carbocation has more reactivity than a primary carbocation. The nucleophile anyhow has to attack the carbocation and a tertiary carbocation will offer steric hindrance. A primary carbocation won’t offer a steric hindrance to the nucleophile.
I know a tertiary carbocation is more stable than a primary carbocation but why is steric crowding not taken into consideration?

'x' gm of a compound A3B2C5 contains 'y' gm of A atoms

 

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how to represent the possible fischer projections for 2-bromohexane