• Nomenclature of ethers - class-XII
Back
0

Nomenclature of ethers - class-XII

Description: nomenclature of ethers
Number of Questions: 15
Created by:
Tags: alcohols, phenols and ethers organic compounds with functional group containing oxygen (part-1) chemistry
Start the Quiz
Attempted 0/15 Correct 0 Score 0
‹
›

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


IUPAC name of the compound is :

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. Ethoxybenzene

  2. Phenoxyethane

  3. Benzoxyethane

  4. None of these

Show answer
Correct Option: A

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

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. Formy methyl ethyl ether

  2. Ethyl aldo methyl ether

  3. 2-ethoxy formate

  4. 2-ethoxy ethanal

Show answer
Correct Option: D

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

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. ethoxymethane

  2. methoxyethane

  3. methylethyl ether

  4. ethylmethyl ether

Show answer
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 :

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. ketone

  2. aldehyde

  3. alcohols

  4. esters

Show answer
Correct Option: C

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

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. 1-Phenoxyheptane

  2. 1-Heptoxybenzene

  3. Both (a) and (b)

  4. None of these

Show answer
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: 

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

nomenclature of ethers alcohols, phenols and ethers chemistry

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

  2. $2-$Methylpropane-methane

  3. both (A) and (B)

  4. none of these

Show answer
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:

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. 1-Methoxypropane

  2. 1-Propoxymethane

  3. both (A) and (B)

  4. none of these

Show answer
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 $C _{2}H _{5} O C _{2}H _{5}$ :

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. Diethyl ether

  2. Ethoxy ethane

  3. Ethoxy propane

  4. Dimethyl ether

Show answer
Correct Option: B

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

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. alphabetical order

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

  3. both A and B

  4. none of these

Show answer
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 :

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. alkoxy group

  2. alkyl group

  3. carbonyl group

  4. epoxy group

Show answer
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.

In ethers the numbering of the parent chain is done in a way:

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. that the carbon atom linked to the -O-atom gets the lowest number.

  2. that the carbon atom linked to the -O-atom gets the highest number.

  3. that the carbon atom which comes from parental hydrocarbon linked to the -O-atom gets the lowest number

  4. none of these

Show answer
Correct Option: A
Explanation:

While doing the numbering of longest parent chain in the ether, it is ensured that the carbon atom linked to the $-O-$ atom gets the lowest number, according to IUPAC nomenclature.

Which of the following statement is not correct in the naming of ethers according to IUPAC rules?

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. Ethers are named as alkoxy alkanes

  2. The numbering of the parent chain is done in such a way so that the carbon atom linked to the -O-atom gets the lowest number.

  3. The two alkyl groups attached to the oxygen are put in alphabetical order

  4. In the case of simple ethers, the prefix tri is attached before the name of the alkyl group.

Show answer
Correct Option: D
Explanation:
If both the alkyl groups attached to the $-O-$ atoms are same, then the prefix 'di' is added before the alkyl group. 
Example: $CH _3-O-CH _3$ is named as dimethyl ether.

Which of the following naming is not given correctly?

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. $C _2H _5 - O - C _2H _5$ is Diethyl ether

  2. $C _6H _5 - O - C _6H _5$ is Diphenyl ether

  3. $C _2H _5 - O - C _6H _5$ is Ethyl phenyl ether

  4. $C _2H _5 - O - C _3H _7$ is Diethyl propylether

Show answer
Correct Option: D
Explanation:

$C _2H _5$ is ethyl and $C _3H _7$ is propyl. Therefore, the correct common name, arranged in alphabetical order will be Ethyl Propyl Ether.

IUPAC name of the compound $CH _3-\underset{\displaystyle CH _3}{\underset{|}CH}-OCH _3$ is:

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. 1 - methoxy - 1 - methylethane

  2. 2 - methoxy - 2 - methylethane

  3. 2 - methoxypropane

  4. isopropylmethyl ether.

Show answer
Correct Option: C
Explanation:

Given molecule: $CH _3-\underset{\displaystyle CH _3}{\underset{|}CH}-OCH _3$

It is an ether $ROR'$. In naming ether, smaller alkyl group among R and R' is treated as side group as alkoxy and the other as alkane along with the position of the alkoxy group. Thus in the given molecule, it is methoxy group at second position of propane (alkane)
$\overset { 1 }{ C } H _{ 3 }-\underset { \overset { 3 }{ C } H _{ 3 } }{ \underset { | }{ \overset { 2 }{ C }  }  }H -OCH _{ 3 }$
Thus its name is: 2-methoxypropane.

Find out the statement which is not correct in the naming of cyclic ethers.

nomenclature of ethers alcohols, phenols and ethers chemistry

  1. If a substituent is an alcohol, the alcohol has higher priority

  2. If a substituent is a halide, ether has higher priority

  3. If both an alcohol group and a halide are present, alcohol has higher priority

  4. If a substituent is an alcohol, the ether has higher priority

Show answer
Correct Option: D
Explanation:

In IUPAC naming of cyclic ethers, if a substituent is an alcohol, the alcohol is given the higher priority over the ether.


Hence, the correct option is $D$

- Hide questions
ADVERTISEMENT

Find more quizzes from top tags

general knowledge
3615 Quizzes
119858 Questions
 technology
307 Quizzes
36705 Questions
 sports
963 Quizzes
19148 Questions
 history
1187 Quizzes
13475 Questions
 physics
598 Quizzes
13441 Questions
 biology
1160 Quizzes
12174 Questions
 science & technology
551 Quizzes
11015 Questions
 chemistry
490 Quizzes
9892 Questions
 maths
518 Quizzes
9324 Questions
 softskills
0 Quizzes
7131 Questions