Question

a) How Huckel's rule is applied? b) Out of cyclopentadiene and cyclopentadienyl anion which one is aromatic and why? c) Which conditions are essentially required for a compound to be aromatic

(a) Draw the cis- and trans-structures for hex-2-ene. Which isomer will have higher b.p. and why? (b) What are the necessary conditions for any system to be aromatic? Why is benzene extraordinarily stable though it contains three double bonds?

(a) An alkene 'A' on ozonolysis gives a mixture of ethanal and pentan-3-one. Write structure and IUPAC name of 'A' (b) What are the necessary conditions for any system to be aromatic? Write any two. (c) Draw the cis and trans structures of hex-2-ene. Which isomer will have higher b.p. and why?