Tag: alcohols, phenols and ethers

Quizzes (9) Questions (75)

Questions Related to alcohols, phenols and ethers

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

Ethers are considered as ____.

  1. mono alkyl derivatives of water

  2. alkoxy derivations of alkanes

  3. alkyl derivatives of fatty acids.

  4. condensation product of acid and alcohol.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Ethers can be viewed as derivatives of hydrocarbons where a hydrogen atom is replaced by an alkoxy group (-OR), making them alkoxy derivatives of alkanes. Alternatively, they can be seen as dialkyl derivatives of water.

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Diethyl ether reacts with chlorine in the presence of sunlight to replace all hydrogen atoms with chlorine, resulting in perchloro diethyl ether.

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

Isopropyle methyl ether when treated with cold hydrogen iodide gives

  1. isopropyl iodide and methyl iodide

  2. isopropyl alcohol and methyl iodide

  3. isopropyl alcohol and methyl alcohol

  4. isopropyl iodide and methyl alcohol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Cleavage of ethers with HI follows an SN2 mechanism for primary/secondary alkyl groups. Isopropyl methyl ether yields isopropyl alcohol and methyl iodide.

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

Oxygen atom of ether is: 

  1. very active

  2. replaceable

  3. active

  4. comparatively inert
Reveal answer Fill a bubble to check yourself
D Correct answer
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.
Multiple choice chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

Diethyl ether can be decomposed with:

  1. $HI$
  2. $KMnO _4$
  3. $NaOH$
  4. $H _2O$
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

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

  1. $HCl < HBr < HF$
  2. $HI > HBr > HCl $
  3. $HF < HCl < HBr $

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $HI>HBr>HCl$