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Physical Properties of Alkenes

There are thr...

Question

There are three common ways to convert an alkene into alcohol:
(A) acid catalyzed hydration, (B) hydroboration-oxidation and (C) oxymercuration-demarcation. Which of the following statements about these reactions is incorrect?

(1)

C l_{2} / h v

followed by

K O H

(2)

B r_{2} / C C l_{4}

followed by

K O H

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(1)

B r_{2} / h e a t

followed by

K O H

(2)

N B S / D M S O / H_{2} O

followed by

K O H

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(1)

C l_{2} / h v

followed by

N a O H

(2)

H B r

followed by KOH

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(1)

B r_{2} / h v

followed by

N a O H

(2)

O s O_{4} / N a H S O_{3}

followed by HBr

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Solution

The correct option is B (1) $C l_{2} / h v$ followed by $K O H$ (2) $B r_{2} / C C l_{4}$ followed by $K O H$
The reagent alcoholic $K O H$ is used for the preparation of alkenes as it is dehydrohalogenation reaction. After halogenation action of alcoholic $K O H$ forms Alkenes again not alcohols.

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Similar questions

Q. Consider the following transformations.

H - C \equiv C - C H_{2} - C H_{2} - C H_{3} \to H_{3} C - C H = C H - C H_{2} - C H_{3}

Which reaction sequence will bring about the above transformation?

Q. A dichloroderivative

(A)

on treating with

K C N

followed by acid hydrolysis and heating gives a monobasic acid

(B)

along with liberation of

C O_{2}

(B)

on heating with liquid ammonia followed by treating with

B r_{2} / K O H

gives

(C)

which on treating with

N a N O_{2}

and

H C l

at low temperature followed by oxidation gives a monobasic acid

(D)

having molecular mass

74

C

in the whole process would be:

Q. Alkene can be prepared from alkyl halide by the following reagent

R - X + N ¯ u \to A l k e n e + N u H

Given compound (A) upon treatment with

K M n O_{4} / H^{+}

gives (B), which on heating with ammonia produces (C). (C) on treatment with

B r_{2} / N a O H

produces (D). Strongly heating (C) produces (E) which on further reatment with ethyl 2-bromoacetate in the presence of

K O H

followed by acidification gives (F).

(D) is:

Reagent used in the conversion of

(C H_{3} - C H_{3} \to C H_{3} - C H_{2} - O H) alkane \to alcohol

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There are three common ways to convert an alkene into alcohol: (A) acid catalyzed hydration, (B) hydroboration-oxidation and (C) oxymercuration-demarcation. Which of the following statements about these reactions is incorrect?

The correct option is B (1) Cl2/hv followed by KOH (2) Br2/CCl4 followed by KOHThe reagent alcoholic KOH is used for the preparation of alkenes as it is dehydrohalogenation reaction. After halogenation action of alcoholic KOH forms Alkenes again not alcohols.

There are three common ways to convert an alkene into alcohol:
(A) acid catalyzed hydration, (B) hydroboration-oxidation and (C) oxymercuration-demarcation. Which of the following statements about these reactions is incorrect?

The correct option is B (1) $C l_{2} / h v$ followed by $K O H$ (2) $B r_{2} / C C l_{4}$ followed by $K O H$
The reagent alcoholic $K O H$ is used for the preparation of alkenes as it is dehydrohalogenation reaction. After halogenation action of alcoholic $K O H$ forms Alkenes again not alcohols.