a. 7- Bromocycloheptraiene (tropylium bromide) completely dissociates in water and givesa yellow precipiate of AgBr with AgNO_(3). Why? (b) Why is cyclopentadiene (K_(a) = 10^(-15)) much more acidic than 1,3- cyclohexadience? C. Explain the following 1,3,5-cycloheptatrience through a cycle, planner triene with six pi vec(e)'s is not armoatic, whereas tropolonebehaves like a phenol.

a. 7- Bromocycloheptraiene (tropylium bromide) completely dissociates

1.	a. 7- Bromocycloheptraiene (tropylium bromide) completely dissociates in water and givesa yellow precipiate of AgBr with AgNO_(3). Why? (b) Why is cyclopentadiene (K_(a) = 10^(-15)) much more acidic than 1,3- cyclohexadience? C. Explain the following 1,3,5-cycloheptatrience through a cycle, planner triene with six pi vec(e)'s is not armoatic, whereas tropolonebehaves like a phenol.
Answer» Solution : The cycloheptatrienyl carbocation formed by the loss of `Br^(o-)` is STABLE due to AROMATIC character. b. C. Troplylim is not aromatic, while tropolone is aromatic. SEE Illustration `11.6(13)` and `(16)`