Tag: hydroxy compounds and ethers

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Questions Related to hydroxy compounds and ethers

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

An ether is more volatile than alcohol having the same molecular formula. This is due to:

  1. intermolecular hydrogen bonding in ethers

  2. dipolar character of ethers

  3. alcohols having resonance structures

  4. intermolecular hydrogen bonding in alcohols
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An ether which is almost nonpolar is more volatile than alcohol having same molecular formula .this is due to intermolecular hydrogen bonding in alcohols .so alcohols have high bonding point.

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

An organic compound with molecular formula $C _4H _{10}O$ does not react with sodium . With excess of HI it gives only one type of alkyl halide. The compound is:

  1. $C _2H _5OC _2H _5$
  2. $CH _3{\underset{OCH _3}{\underset{|}{C}}}HCH _3$
  3. $CH _3CH _2CH _2OCH _3$
  4. $CH _3CH _2CH _2CH _2OH$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

$C _4H _{10}O$ can have two structures :


$CH _3CH _2CH _2CH _2OH$   and  $C _2H _5OC _2H _5$.

Since it does not react with Na metal, it can not be an alcohol.

$C _2H _5OC _2H _5 + \underset{excess}HI\rightarrow 2C _2H _5I + H _2O$

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

Which of the following products are not correctly matched in the given reactions?

  1. $C _2H _5OCH _3 + HBr \xrightarrow{373K} C _2H _5OH + CH _3Br$
  2. $C _2H _5OC _2H _5 + 2HI \rightarrow C _2H5I + C _2H _5OH$
  3. $C _2H _5OC _2H _5 + \overset{Excess}{HCl} \xrightarrow{Cold} [(C _2H _5) _2O^+H]Cl^-$
  4. $(CH _3) _3COC _2H _5 \xrightarrow{HI} (CH _3) _3CI + C _2H _5OH$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

$C _2H _5-O-C _2H _5 +\underset{(excess)} 2HI \rightarrow 2C _2H _5I + H _2O$

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

Anisole on reaction with chloromethane in presence of anhydrous $AlCl 3$ gives __________.

  1. o-methyl anisole and p-methoxy anisole

  2. p-methyl anisole and p-methoxy anisole

  3. o-methyl anisole and p-methyl anisole

  4. o-methoxy acetphenone and p-methoxy acetophenone .
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Anisole i.e. Phenyl methyl ether $CH _3OC _6H _5$ reaction with Chloromethane in the presence of anhy $AlCl _3$ electrophilic substitution reaction at ortho and para position w.r.t. methoxy group on benzene ring. It is called Friedel-craft alkylation reaction and represented as:
$C _6H _5OCH _3+ CH _3Cl \overset {AlCl _3}{\rightarrow} o-CH _3C _6H _5OCH _3+p-CH _3C _6H _5OCH _3$
Hence Anisole on reaction with chloromethane in presence of anhydrous AlCl3 gives o-methyl anisole and p-methyl anisole
Multiple choice chemistry hydroxy compounds and ethers chemical properties of ethers ethers alcohols, phenols and ethers

The number of monochloro derivaties of 2-methoxy propane are possible are: 

  1. 2

  2. 1

  3. 3

  4. 4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

$\quad \quad \quad OC{ H } _{ 3 }\ \hspace{2mm} \quad \quad \quad |\ { H } _{ 3 }C-CH-C{ H } _{ 3 }$

2-methoxypropane
The number of monochloro derivatives are 3. They are:
1) $\quad \quad \hspace{2mm} \quad OC{ H } _{ 3 }\ \quad \quad \quad \quad |\ { H } _{ 2 }C-CH-C{ H } _{ 3 }\ \quad |\ \hspace{2mm} Cl$
2) $\quad \quad  \quad OC{ H } _{ 3 }\ \quad \hspace{2mm} \quad \quad |\ { H } _{ 3 }C-C-C{ H } _{ 3 }\ \quad \quad \hspace{2mm} \quad |\ \quad \quad \quad Cl$
3) $\quad \quad  \quad OC{ H } _{ 2 }-Cl\ \quad \hspace{2mm} \quad \quad |\ { H } _{ 3 }C-C-C{ H } _{ 3 } $

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.