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Vicinal dihalides undergo double dehydro...


Vicinal dihalides undergo double dehydrohalogenation to give terminal alkyne. How many moles of `NaNH_2` are used in the overall reaction?

A

One

B

Two

C

Three

D

Four

Text Solution

Verified by Experts

The correct Answer is:
C

Double dehydrohalogenation requires 2 mol of `NaNH_2`. The terminal alkyne is converted to alkynyl anion as soon as it is formed. Thus, 3 mol of `NaNH_2` of the base are used in the overall reaction.
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CENGAGE CHEMISTRY ENGLISH-ALKYNES-Exercises (Single Correct Answers Type)
  1. Give the reactivity in the decreasing order of the following alkynes t...

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  2. Give the reactivity in the decreasing order of the following nucleophi...

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  3. Vicinal dihalides undergo double dehydrohalogenation to give terminal ...

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  4. The minimum number of C atoms an alkyne must have to show diastereomer...

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  5. Which of the following is propargyl group?

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  6. What is the smallest ring that can accommodate a triple bond?

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  7. In the conversion of alkyne to trans-alkene by Birch reduction using a...

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  8. In the reaction, R--=-Roverset(Birch)underset(reduction)rarr source ...

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  9. In the reaction:

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  10. Interconversion of terminal to internal alkyne and vice versa takes pl...

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  11. R-underset((A))-=--=-Roverset("Lindlar's catalyst" +H2)rarr(B) Co...

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  12. Compounds (B) and (C) are:

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  13. (B), (C), and (D), respectively, are

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  14. Expand the following condensed formulas into their complete structural...

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  17. A, B, and C:

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  18. Compound (X) on complete catalytic hydrogenation with H2//Pt gives an ...

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  19. Cl3-underset((X))-=-Hunderset(D2+P-2catalyst)rarr(A)overset(HCl)rarr(B...

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  20. H--=-Hoverset((i)O3)underset((ii)(H2O)//(Zn))rarr(A)overset(Zn//CH3COO...

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