Identify the end product (Z) in the sequence of the following reactions:





The sequence of reactions starts with a base-promoted elimination, followed by a rearrangement and a substitution to finally produce the ester \(O_2CCH_3\) as the end product.
Which of the following are aromatic?

Give plausible explanation for:
(a) Diazonium salts of aromatic amines are stable.
(b) Aniline does not undergo Friedel-Crafts reaction.
(c) Aniline on nitration gives substantial meta product.
In a messenger RNA molecule, untranslated regions (UTRs) are present at:
I. 5' end before start codon
II. 3' end after stop codon
III. 3' end before stop codon
IV. 5' end after start codon