Tag: alcohols, phenols and ethers

Questions Related to alcohols, phenols and ethers

 $\displaystyle C _{6}H _{5}-O-C _{2}H _{5}$  


IUPAC name of the compound is :

  1. Ethoxybenzene

  2. Phenoxyethane

  3. Benzoxyethane

  4. None of these


Correct Option: A

 The IUPAC name of $CH _3 CH _2OCH _2 \overset{O}{\overset{||}{C}} - H$ is 

  1. Formy methyl ethyl ether

  2. Ethyl aldo methyl ether

  3. 2-ethoxy formate

  4. 2-ethoxy ethanal


Correct Option: D

IUPAC name of the $ CH _3 - O - C _2H _5 $ is:

  1. ethoxymethane

  2. methoxyethane

  3. methylethyl ether

  4. ethylmethyl ether


Correct Option: B
Explanation:
In IUPAC system, ethers are named as alkoxy alkaline. The ethernal oxygen is taken with a smaller alkyl group and forms a part of the alkoxy group while larger alkyl group is considered to be the part of alkyl. 
$CH _3-o-C _2H _5$
Methoxyethane.

The functional isomers of ethers are :

  1. ketone

  2. aldehyde

  3. alcohols

  4. esters


Correct Option: C

$\displaystyle C _{6}H _{5}-O-C _{7}H _{15}\left ( n \right )$ IUPAC name of the compound is :

  1. 1-Phenoxyheptane

  2. 1-Heptoxybenzene

  3. Both (a) and (b)

  4. None of these


Correct Option: A
Explanation:

here, phenoxy group ($\displaystyle C _{6}H _{5}-O-$) is attached with heptane so its name is 1-Phenoxyheptane

IUPAC name of the given compound is: 

$CH _3-O-CH _2-CH(CH _3)-CH _3$

  1. $1-$Methoxy$-2-$methylpropane

  2. $2-$Methylpropane-methane

  3. both (A) and (B)
  4. none of these


Correct Option: A
Explanation:

The IUPAC names of the following compounds 1-Methoxy-2-methylpropane. Here methoxy group is taken as substituent.

IUPAC name of  $\displaystyle CH _{3}CH _{2}CH _{2}OCH _{3}$ is:

  1. 1-Methoxypropane

  2. 1-Propoxymethane

  3. both (A) and (B)

  4. none of these


Correct Option: A
Explanation:

$CH _3CH _2CH _2OCH _3$

3       2        1
IUPAC name for the above compound is 1-methoxy propane.
So answer is A.

The IUPAC name of $C _{2}H _{5} O C _{2}H _{5}$ :

  1. Diethyl ether

  2. Ethoxy ethane

  3. Ethoxy propane

  4. Dimethyl ether


Correct Option: B

According to the IUPAC rules in naming of ether the two alkyl groups attached to the oxygen are put in :

  1. alphabetical order

  2. the larger group (R) is chosen as the parent hydrocarbon

  3. both A and B

  4. none of these


Correct Option: C
Explanation:
In IUPAC rules of naming others, larger alkyl or aryl group (R) is chosen as the parent hydrocarbon and when in writing, all substituents are arranged in alphabetical order.
Example: $CH _3-O-C _2H _5$, the name of this compound will be methoxy ethane.

According to the IUPAC nomenclature ethers are regarded as hydrocarbon derivatives in which a hydrogen atom is replaced by an :

  1. alkoxy group

  2. alkyl group

  3. carbonyl group

  4. epoxy group


Correct Option: A
Explanation:
In IUPAC nomenclature of ethers, a hydrogen atom is replaced by $-OR$ (alkoxy group) or $-OAr$ (aryloxy group)
Example: $CH _3-O-CH _3$ is an ether which is obtained by replacing one hydrogen atom from methane with methoxy group ($-OCH _3$). Thus, the ether will be named as methoxymethane.