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Cyclobutyl bromide on treatment with mag...

Cyclobutyl bromide on treatment with magnesium in dry ether forms an organometallic compound `(A)`. The organometallic compound `(A)` reacts with ethanal to give an alcohol `(B)` after mild acidification. Prolonged treatment of alcohol `(B)` with an equivalent amount of `HBr` gives 1-bromo-1-methylcyclopentane ( C) Write the structures of `(A)` and `(B)`, and explain how `(C)` is obtained from `(B)`.

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Cyclopentyl bromide on treatment with magnesium in dry ether forms an. organometallic compound (A), The organometallic compound reacts with ethanal to give an alcohol (B) after mild hydrolysis. Prolonged treatment of alcohol (B) with an equivalent amount of HBr givos 1-bromo 1- methylcyclohexane (C). Write the structure of (A), (B) and explain how (C) is obtained from (B)?

A compound (A) reacts with thionylchloride to give a compound (B). (B) reacts with magnesium to form a Grignard reagent which is treated with acetone and the product is hydrolysed to give 2-methyl butan-2-ol. What are the structural formulae of (A) and (B) ?

An organic compound (A) (C_(6)H_(10)O) on reaction with CH_(3)MgBr followed by acid treatment gives compound (B). The compound (B) on ozonolysis gives compound (C ), which in the presence of a base gives 1-acetyl cyclopentane (D). The compound (B) on reaction with HBr gives compound (E ). Write the structures of (A), (B), (C ), (D), and (E ). Show how (D) is formed from (C ).

An organic compound (A) (C_(6)H_(10)) on reaction with CH_(3)MgBr followed by acid treatment gives compound (B). The compound (B) on ozonolysis gives compound (C ), which in the presence of a base gives 1-acetylcyclo-pentene (D). The compound (B) on reaction with HBr gives (E ). Write the structures of (A), (B), (C ), and (E). Show how (D) is formed form (C ).

A Grignard reagent (A) and a haloalkene (B) react together to give (C) . Compound (C) on heating with KOH yeilds a mixture of two geometrical isomers (D) and € of which (D) predominates . Compound (C) on reaction with HBr in presence of a peroxide gives 1-bromo-3- phenylpropane. Give the structures of (A), (B) and (C) and configurations of (D) and (E).

ALLEN-ALKENE, ALKANE & ALKYNE -EXERCISE-5[B]
  1. Write the intermediate steps for each of the following reactions (i)...

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  2. o-Hydroxy benzaldehyde is more soluble in water than p-hybroxy benzald...

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  3. Cyclobutyl bromide on treatment with magnesium in dry ether forms an o...

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  4. How would you synthesise 4-methoxyphenol from bromobenzene in not mo...

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  5. Identify Z + Y in the following synthetic scheme and write their struc...

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  6. Compound (X) on reduction with LiAlH(4) gives a hydride (Y) containing...

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  7. Mention two esters produced when a recemic mixture of 2-phenyl propano...

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  8. Write steps to carry out the conversion of phenol to aspirin.

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  9. Convert in not more than four steps. Also mention the reaction con...

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  10. Identify (X) and (Y).

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  11. When phenyl magnesium bromide reacts with t-bytyl alcohol, the product...

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  12. Statement-I: p-Hydroxybenzoic acid has a lower boiling point that o-hy...

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  13. In the reaction OCH(3)overset(HBr)rarr the product are:

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  14. In the following reacation. The product(s) formed is/are

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  15. The acidic hydrolysis of ether (X) shown below is fastest when

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  16. The number of hydroxyl group(s) in Q is

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  17. Reagent (s) which can be used to bring about the following transformat...

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  18. The formation of cyanohydrin from ketone is an example of :

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  19. The enolic form of acetone contains

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  20. m-Chlorobenzaldehyde on reaction with conc. KOH at room temperature gi...

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