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- The purine heterocycle occurs commonly in the structure of DNA.a.How is each N atom hybridized? b.In what type of orbital does each lone pair on a N atom reside? c.How many π electrons does purine contain? d.Why is purine aromatic?Which of the following compounds is aromatic? A. only A and B B. only A and C C. only B and C D.only B1. (a) Describe aromaticity, Kekule structure and resonance structure for benzene. (b) Why is benzene more stable than aliphatic alkenes?
- 1. Thiophene,furan and pyrrole which is more aromatic and reactive? 2. Heterocyclicgroups in haemoglobin,folic acid, morphine and caffeine.Electrophilic aromatic substitution usually occurs at the 1-position of naphthalene, also called the a position. Predict the major products of the reactions of naphthalene with HNO3, H2SO4.Tell whether the final products in the given reactions are aromatic or not?
- Electrophilic aromatic substitution usually occurs at the 1-position of naphthalene, also called the a position. Predict the major products of the reactions of naphthalene with isobutylene and HFExplain the relevance pi* (antibonding) -molecular orbitals have in nucleophilic addition reactions of carbonyl containing compounds.Which of the molecules and ions given in Problem 21.15 are aromatic according to the Hckel criteria? Which, if planar, would be antiaromatic? 21.15 State the number of 2p orbital electrons in each molecule or ion.
- N-Phenylsydnone, so-named because it was first studied at the University of Sydney, Australia, behaves like a typical aromatic molecule. Explain, using the HĂ¼ckel 4n + 2 rule.Compound A exhibits a peak in its 1H NMR spectrum at 7.6 ppm, indicating that it is aromatic. (a) How are the carbon atoms of the triple bonds hybridized? (b) In what type of orbitals are the π electrons of the triple bonds contained? (c) How many π electrons are delocalized around the ring in A?Which (if any) lone pairs are participating in aromaticity?
