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The best sequence of reactions to prepar...

The best sequence of reactions to prepare 2-heptanone is

A

propyne `overset(NaNH_(2))rarr X overset(n-C_(4)H_(9)Br)rarr Y underset(H_(2)SO_(4))overset(H_(2)O, Hg^(2+))rarr`

B

ethyne `overset(NaNH_(2))rarr X overset(n-C_(5)H_(12)Br)rarr Y underset(H_(2)SO_(4))overset(H_(2)O, Hg^(2+))rarr`

C

1-hexyne `overset(NaNH_(2))rarr X overset(CH_(2)Br)rarr Y underset(H_(2)SO_(4))overset(H_(2)O, Hg^(2+))rarr`

D

1-pentyne `overset(NaNH_(2))rarr X overset(C_(2)H_(5)Br)rarr Y underset(H_(2)SO_(4))overset(H_(2)O, Hg^(2+))rarr`

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The correct Answer is:
B
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MS CHOUHAN-HYDROCARBONS (ALKYNES)-Level -1
  1. To carry out above conversion , (A) and (B) respectively, are :

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

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

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

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

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

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  7. Compound (X) will be :

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

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  9. Which alkyne yields butanoic acid (CH(3)CH(2)CH(2)CO(2)H) as the only ...

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  10. (A) Unit of unsaturation in compound (A) ?

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  11. product (C) of above reaction is :

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  12. To convert 1-butyne to 1-D-butanal, one would carry out the following ...

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  13. An unknown compound (A) has a molecular formula C(4)H(6). When (A) is ...

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  14. 1, 2-Dibromo propane on treatment with X moles of NaNH(2) followed by ...

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  15. CH(3)-overset(CH(3))overset(|)(CH)-C-=CH overset("excess HBr")rarr T...

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  16. CH(3)-C-=C-CH(3) overset("Cold " KMnO(4))rarr (A) product (A) is :

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  17. In which reaction last product is Ph-C-=CH ?

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  18. Predict the product of the following reaction sequence. ethyne under...

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  19. The best sequence of reactions to prepare 2-heptanone is

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  20. The major product of the reaction of 2-butene with cold alkaline KMnO(...

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