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Chapter 17: Q.11. (page 641)

Question: Draw the four resonance structures for anthracene.

Short Answer

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Answer

Resonating structures of anthracene

Step by step solution

01

Resonance

A molecule is said to possess resonance when it can be represented by more than one Lewis structure.

Resonating structures are drawn by the movement of only pi or non-bonding electrons.

In all the possible representation atom鈥檚 position is unchanged.

02

Resonance structures of anthracene  

Four resonating structures are possible for anthracene.

Resonance structures of anthracene

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Most popular questions from this chapter

Question: Which of the following heterocycles are aromatic?

Draw the structure corresponding to each name

  1. isobutyl benzene
  2. o-dichlorobenzene
  3. cis-1,2-diphenylcyclohexane
  4. m-bromoaniline
  5. 4-chloro-1,2-diethylbenzene
  6. 3-tert-butyl-2-ethyltoluene

Question: AZT was the first drug approved to treat HIV, the virus that causes AIDS. Explain why the six-membered ring of AZT is aromatic.

Question: Pentalene, azulene, and heptalene are conjugated hydrocarbons that do not contain a benzene ring. Which hydrocarbons are especially stable or unstable based on the number of electrons they contain? Explain your choices.

Question: Stanozolol is an anabolic steroid that promotes muscle growth. Although stanozolol has been used by athletes and bodybuilders, many physical and psychological problems result from prolonged use and it is banned in competitive sports.

a. Explain why the nitrogen heterocycle鈥攁 pyrazole ring鈥攊s aromatic.

b. In what type of orbital is the lone pair on each N atom contained?

c. Draw all reasonable resonance structures for stanozolol.

d. Explain why the pKaof the N-H bond in the pyrazole ring is comparable to the pKa of O-H bond, making it considerably more acidic than amines such as CH3NH2( pKa= 40).
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