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The purine heterocycle occurs commonly i...

The purine heterocycle occurs commonly in the structure of DNA.
(a) How is each N atom hydridized?
(b) In what type of orbital does each lone pair on a N atom reside?
(c) How many `pi` electrons does purine contain?
Why is purine aromatic?

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Verified by Experts

The correct Answer is:
`(a) sp^(2), (b) 'p'"orbital",(c) 10pi^(-)`
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HIMANSHU PANDEY-GENERAL ORGANIC CHEMISTRY-Subjective Type Problems
  1. Which of the following systems are conjugated?

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  2. Draw all reasonable resonance structures for each species.

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  3. Draw all reasonable resonance structures for each species.

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  4. Determine the hybridization at the carbon atom indicated in each speci...

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  5. Explain each statement using resonance theory. (a) The indicated C-...

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  6. Rank the following dienes in order of increasin heat of hydrogenation.

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  7. How many pi electrons are contained in each molecule ?

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  8. Which compaounds are aromatic? For any compound that is not aromatic, ...

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  9. Which of the following heterocycles are aromatic?

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  10. Lebel each compound as aromatic, antiaromatic, or not aromatic. Assume...

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  11. Hydrocarbons A and B both possess a significant dipolel, even though e...

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  12. Rank the indicated C-C bonds in order of increasing bond length, and e...

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  13. The purine heterocycle occurs commonly in the structure of DNA. (a) ...

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  14. (a) How many pi electrons does C contion? (b) How many pi electrons ...

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  15. Draw additional resonance structure for each species.

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  16. The carbon-carbon bond lengths in naphthalene are not equal. Use a res...

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  17. Which compound in each pair is the stronger acid?

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  18. Treatment of indene with NaNH(2) forms its conjugate base in a Bronste...

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  19. Draw the conjugate bases of pyrrole and cyclopentadiene. Explain why t...

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