Tag: alcohols, phenols and ethers

Questions Related to alcohols, phenols and ethers

Ether on carbonylation gives:

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. Alkanoic acid

  2. Alkanone

  3. Alkyl alkonate

  4. Alkanal

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Correct Option: C
Explanation:

The general reaction between Ether and Carbon monoxide is 


$R-O-R+CO \rightarrow R-CO-O-R$ 

Thus, it forms the ester Alkyl alkanoate.


Option C is the correct answer.

Ethers are considered as ____.

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. mono alkyl derivatives of water

  2. alkoxy derivations of alkanes

  3. alkyl derivatives of fatty acids.

  4. condensation product of acid and alcohol.

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Correct Option: D

The compound obtained by the reaction of diethyl ether with chlorine in the presence of sun light , is 

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. Perchloro diethyl ether $H _5C _2-OC _2Cl _5$

  2. Perchloro diethyl ether $Cl _5C _2-O-C _2Cl _5$

  3. $\beta ,\beta '$ Dichloro diethyl ether $ClCH _2CH _2-O-CH _2CH _2Cl$

  4. $\alpha ,\alpha $ Dichloro diethyl ether

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Correct Option: B

Diethyl ether reacts with $\displaystyle PCl _{5}$ to form:

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. ethyl chloride

  2. phosphorous oxy trichloride

  3. 1,2-dichloroethane

  4. ethene

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Correct Option: A,B
Explanation:

Diethyl ether reacts with Phosphorous pentachloride on heating to form ethyl chloride.

$C _2H _5-O-C _2H _5+PCl _5\longrightarrow 2C _2H _5Cl+POCl _3$

Isopropyle methyl ether when treated with cold hydrogen iodide gives

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. isopropyl iodide and methyl iodide

  2. isopropyl alcohol and methyl iodide

  3. isopropyl alcohol and methyl alcohol

  4. isopropyl iodide and methyl alcohol

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Correct Option: B

Oxygen atom of ether is: 

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. very active

  2. replaceable

  3. active

  4. comparatively inert

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Correct Option: D
Explanation:
Oxygen atom of ether is comparatively inert.

 $C-O-C$ linkage is quite stable. Under ordinary conditions, ethers are not acted upon by dilute acids, bases and most of the oxidizing and reducing agents. 

Hence correct answer is option D.

$C _2H _5-O-C _2H _5 +  HI \xrightarrow {?}  C _2H _5-OH + C _2H _5-I$
Identify the reaction condition, in which reaction occur.

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. High temperature

  2. High vaccum

  3. Cold

  4. None of the above

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Correct Option: A
Explanation:

The cleavage of ethers takes places with concentration $HI$ or $HBr$ at high temperature.

Diethyl ether can be decomposed with:

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. $HI$

  2. $KMnO _4$

  3. $NaOH$

  4. $H _2O$

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Correct Option: A
Explanation:

On heating with concentrated Hydrogen iodide $(HI)$ the C-O bond in ethers breaks forming alcohol and alkyl iodide. For example,

 ${ C } _{ 2 }{ H } _{ 5 }-O-{ C } _{ 2 }{ H } _{ 5 }+HI\longrightarrow { C } _{ 2 }{ H } _{ 5 }-I+{ C } _{ 2 }{ H } _{ 5 }OH$

 On boiling with excess of concentrated Hydrogen iodide $(HI)$, Alkyl iodide is formed.

${ C } _{ 2 }{ H } _{ 5 }-O-{ C } _{ 2 }{ H } _{ 5 }+2HI\longrightarrow 2{ C } _{ 2 }{ H } _{ 5 }-I+{ H } _{ 2 }O$

When an ether is treated with $P _2S _5$, it gives:

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. thioalcohol

  2. thioether

  3. thioester

  4. thioacetal

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Correct Option: B
Explanation:

When an ether is treated with $P _2S _5$, it gives thioether.


$5C _2H _5-O-C _2H _5+P _2S _5\rightarrow\underset{Thioether}{5C _2H _5-S-C _2H _5}$

Hence option B isthe correct answer.

Ethers are heated with excess of conc. hydrogen halide to give alkyl halide, then the reactivity order of hydrogen halide is :

chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

  1. $HCl < HBr < HF$

  2. $HI > HBr > HCl $

  3. $HF < HCl < HBr $

  4. none of these

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Correct Option: B
Explanation:

When $HX$ is in excess and reaction is carried out at high temperature. Iodine is a good nucleophile, displaces an alcohol molecule by $SN^2$ mechanism thus $HI>HBr>HCl$