Correct statements for the given reaction are :

A. Compound '$$\mathrm{B}$$' is aromatic

B. The completion of above reaction is very slow

C. 'A' shows tautomerism

D. The bond lengths of C-C in compound $B$ are found to be same

Choose the correct answer from the options given below:

Compound 'B' is

Product [X] formed in the above reaction is :

Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction