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Alkynes contain two pi-bonds but still d...

Alkynes contain two `pi`-bonds but still do not show geometrical isomerism whereas alkenes contain only one `pi`- bond but show geometrical isomerism. Comment

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Which show geometrical isomerism?

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Why do alkynes not show geometrical isomerism?

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PRADEEP-HYDROCARBONS-ADDITIONAL QUESTIONS (SHORT ANSWER QUESTIONS)
  1. Discuss briefly the structure of CsCl.

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  2. Which of the following isomerism is absent is alkynes?

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  3. Alkynes contain two pi-bonds but still do not show geometrical isomeri...

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  4. What happens when calcium carbide is treated with water ? Give chemica...

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  5. Describe with a labelled diagram the laboratory method of preparation ...

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  6. Write the equation for preparation of propyne.

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  7. Why a benzaldehyde less reactive than acetaldehyde towards nucleophili...

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  8. Comment upon acidic character of terminal alkynes

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  9. Account for the order of acidity: "Acetylene" gt "Benzene" gt "Hexa...

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  10. Why do alkynes undergo addition reactions while simple alkenes do not?

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  11. Discuss the stereochemistry of the reduction products obtained when bu...

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  12. Sketch the mechanism of addition of water to alkynes.

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  13. Reactions of Alkynes

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  14. isomerism of alkenes

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  15. discuss the orbital structure of ethene

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  16. Benzene contains three double bonds yet it behaves like a saturated co...

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  17. Why is that the carbon-carbon bond distance in benzene is intermediate...

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  18. Define substitution reactions. Why do arenes undergo substitution reac...

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  19. What is meant by (i) delocalization (ii) resonance energy ?

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  20. The resonance energy of benzene is

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