Phenyl Group and Benzene Ring Directing Groups Quiz
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Questions and Answers

What is the reason behind the difficulty of benzene to undergo addition reactions?

  • Presence of chlorine in the benzene molecule
  • High surface tension of benzene
  • Low boiling point of benzene
  • Due to the delocalization of electrons in the benzene ring (correct)

What method involves passing hexane over a hot catalyst to obtain benzene?

  • Chlorination reaction
  • Hydrogenation process
  • Distillation method
  • Catalytic reforming (correct)

When benzene reacts with chlorine gas or bromine fumes in sunlight, what compound is formed?

  • Hexahalocyclohexane (correct)
  • Dichloro Diphenyl Trichloro
  • Gamixane
  • Cyclohexane

Why are polynitro organic substances considered very explosive?

<p>Contain weaker N-O bonds compared to C-O and N-N bonds (C)</p> Signup and view all the answers

How does adding detergent to water enhance its ability to clean textile?

<p>Decreases water's surface tension (D)</p> Signup and view all the answers

Why is it challenging for benzene to undergo reactions by addition under normal conditions?

<p>Due to the delocalization of electrons in the benzene ring (A)</p> Signup and view all the answers

What is the correct structure of a phenyl group?

<p>C6H5- (C)</p> Signup and view all the answers

Which functional group is a meta directing group on the benzene ring?

<p>Aldehydic (-CHO) (C)</p> Signup and view all the answers

Who is credited with discovering the hexagonal cyclic shape of the benzene molecule?

<p>Kekule (B)</p> Signup and view all the answers

How is benzene obtained from phenol?

<p>By reducing phenol with hot zinc powder (C)</p> Signup and view all the answers

Which organic compound is the most important product obtained from the fractional distillation of coal tar?

<p>Gasoline (D)</p> Signup and view all the answers

What is the chemical formula for a vinyl group?

<p>(CH2=CH2)- (C)</p> Signup and view all the answers

Study Notes

Benzene Properties and Reactions

  • Benzene has difficulty undergoing addition reactions due to its stable delocalized electron ring system.

Production of Benzene

  • Benzene can be obtained by passing hexane over a hot catalyst.

Electrophilic Substitution Reactions

  • Benzene reacts with chlorine gas or bromine fumes in sunlight to form halogenated derivatives.

Nitro Compounds

  • Polynitro organic substances are considered very explosive due to their high reactivity.

Surface Chemistry

  • Adding detergent to water enhances its ability to clean textile by reducing the surface tension of water.

Benzene Structure and Reactivity

  • Benzene's delocalized electron ring system makes it challenging for the molecule to undergo reactions by addition under normal conditions.
  • The correct structure of a phenyl group is a hexagonal cyclic shape.

Functional Groups

  • Nitro (-NO2) is a meta directing group on the benzene ring.

History

  • Michael Faraday is credited with discovering the hexagonal cyclic shape of the benzene molecule.

Obtaining Benzene

  • Benzene can be obtained from phenol.

Coal Tar Products

  • Benzene is the most important product obtained from the fractional distillation of coal tar.

Vinyl Group

  • The chemical formula for a vinyl group is CH=CH2.

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Description

Test your knowledge on the structure of a phenyl group and meta directing groups on the benzene ring. Identify the correct structures and understand their roles in organic chemistry.

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