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underset(C Cl(4))overset(Br(2))rarr unde...

`underset(C Cl_(4))overset(Br_(2))rarr underset((ii) NaNH_(2))overset((i) "alc. KOH")rarr underset("major")((A))`, Product (A) is :

A

`H_(2)C = CH - CH = CH_(2)`

B

`CH_(3)-C-=C-CH_(3)`

C

`CH_(3)-CH_(2)-C-=CH`

D

`CH_(3)-CH = C=CH_(2)`

Text Solution

Verified by Experts

The correct Answer is:
B
Formation of vicinal di-halide followed by two consecutive `E_(2)` reaction. (elimination bimolecular)
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MS CHOUHAN-HYDROCARBONS (ALKYNES)-Level -1
  1. Complete the following reaction

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  2. underset(C Cl(4))overset(Br(2))rarr underset((ii) NaNH(2))overset((i) ...

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  3. CH(3)CH(2)C-=CH underset("liq. " NH(3))overset(NaNH(2))rarr I Produ...

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  4. CH(3) - CH(2) - CH(2) - C -= CH + underset("Lithium amide")(LiNH(2)) r...

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  5. , This conversion can be achieved by :

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  6. Which alkyl will give 3-ethylhexane on catalytic hydrogenation ?

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  7. Reactant P gives products Q of R. The possible reagents are : (...

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  8. Br-(CH(2))(12) - C -= CH overset(NaNH(2))rarr (A) underset("Catalyst")...

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  9. Ph-C-=CH underset(MeOH)overset(MeO^(-))rarr Major product of the react...

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  10. Ph-underset(Cl)underset(|)overset(Cl)overset(|)(C)-CH(3) overset(3NaNH...

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  11. Which combination is best for preparation of the compound (A) shown be...

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  12. Which one of the following is the intermediate in the preparation of a...

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  13. To carry out above conversion , (A) and (B) respectively, are :

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  14. H-C-=C-Ph , Product obtained in this reaction is :

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  15. CH underset((ii) CH(3)Br)overset((i) NaNH(2), NH(3))rarr (A) underset(...

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  16. Which of the following alkyne on treatment with H(2) (2 mole)/Pt gives...

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  17. underset("(Calcium carbide)")(CaC(2)) overset(H(2)O)rarr (A) overset("...

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  18. What is the final product, C, of the following reaction sequence ?

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  19. Compound (X) will be :

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  20. Choose the sequence of steps that describes the best synthesis of 1-bu...

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