Tag: alkanoic acids

Questions Related to alkanoic acids

Sodium salt of an organic acid 'X' produces effervescence with conc. $H _2SO _{4}$. 'X' reacts with the acidified aqueous $CaCl _2$ solution to give a white precipitate which decolourises acidic solution of $KMnO _4$. 'X' is 

chemistry aldehydes, ketones and carboxylic acids alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. $C _6H _5COONa$

  2. $HCOONa$

  3. $CH _3COONa$

  4. $Na _2C _2O _4$

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Correct Option: D

The trivial name of ${ C } _{ 6 }{ H } _{ 5 }CH=CH-COOH$ is :

chemistry aldehydes, ketones and carboxylic acids alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. cinnamic acid

  2. 1-phenyl-2-carboxy ethane

  3. 3-phenyl prop-2-enoic acid

  4. dihydroxy-3-phenyl propionic acid

Show answer
Correct Option: A
Explanation:

The trivial name of this compound is Cinnamic acid. Hence, option A is correct.

The correct name of the given compound :
${ CH } _{ 3 }-\overset { \underset { | }{ H }  }{ \underset { \overset { | }{ OH }  }{ C }  } -{ COOH }$

chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. glycoxal

  2. lactic acid

  3. glycine

  4. glyceraldehyde

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Correct Option: B
Explanation:

The given compound is Lactic acid.

It contain one $-OH$ group and one $-COOH$ group along with 3 carbon atoms.

IUPAC name of $CH _3CH(CH _3)COOH$ is :

chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. butyric acid

  2. propionic acid

  3. 2-methylpropanoic acid

  4. dimethylacetic acid

Show answer
Correct Option: C
Explanation:

As it contains 4 carbon and functional group is carboxylic acid so its name is 2-methyl propanoic acid.

Give the condensed formula of following,
$2 - Hydroxy- 1,2,3-propanetricarboxylic$ acid :

chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. $(HOOC)CH _2C(COOH)(OH)CH _2(COOH)$

  2. $(HOOC)CH _2C(COOH)(COOH)CH _2(OH)$

  3. $(HOOC)CH _3C(COOH)CH _2(COOH)$

  4. $(HOOC)CH _2CH _2C(COOH)(OH)CH _2(COOH)$

Show answer
Correct Option: A
Explanation:
$2 - Hydroxy- 1,2,3-propanetricarboxylic acid$ 
The name suggests functional groups are - three Carboxylic Acid (main) and one Alcohol (secondary) at position C-2, with 3 carbons in main chain. 
The condensed formula is $(HOOC)CH _2C(COOH)(OH)CH _2(COOH)$

Which of the following statements is/are correct?

chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. Methane was named as fire damp as it forms explosive mixture with air

  2. Primary suffixes are added to the root word to show saturation or unsaturation in a C atom

  3. The IUPAC name of valerie acid is pentanoic acid

  4. The common name of hexanoic acid is caproic acid

Show answer
Correct Option: A,B,C,D
Explanation:
Methane was named as fire damp as it forms explosive mixture with air. It is a flammable gas found in coal mines.
Primary suffix  indicates the degree of saturation or unsaturation in the basic skeleton and is added immediately after the root word.
The IUPAC name of Valeric acid is pentanoic acid  being a liquid of pungent odor obtained from valerian roots.
The common name of hexanoic acid is caproic acid with an odor like limburger cheese.

Aspirin is:

chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. Acetyl salicylic acid

  2. Benzoyl salicylic acid

  3. Chloro benzoic acid

  4. Anthranilic acid

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Correct Option: A

Structure of ethanoic acid is:

chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. $\displaystyle { CH } _{ 3 }-{ CH } _{ 2 }-{ CH } _{ 3 }$

  2. $\displaystyle CH _3-\underset {\displaystyle \underset {\displaystyle O}{ ||}}{C}-OH$

  3. $\displaystyle { CH } _{ 3 }-O-{ C } _{ 3 }{ H } _{ 7 }$

  4. $\displaystyle CH _3-\underset {\displaystyle \underset {\displaystyle O}{ ||}}{C}-CH _3$

  5. $\displaystyle CH _3 - CH _2- NH _2$

Show answer
Correct Option: B
Explanation:

Structure of ethanoic acid is $\displaystyle CH _3-\underset {\displaystyle \underset {\displaystyle O}{ ||}}{C}-OH$. It is also called acetic acid. It can be considered as compound formed by substituting the hydrogen atom of methane with carboxylic group $-COOH$.   

The general formula of carboxylic acids is:

chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. $C _nH _nCOOH$

  2. $C _nH _{2n-1}$

  3. $C _nH _{2n-2}COOH$

  4. $C _nH _{2n+1}COOH$

Show answer
Correct Option: D
Explanation:
The general formula of carboxylic acid is ${ C } _{ n }{ H } _{ 2n+1 }COOH$
$C{ H } _{ 3 }COOH, { C } _{ 2 }{ H } _{ 5 }COOH$...etc

What is the common name of $CH _2=CHCOOH$?

chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

  1. Anthranilic acid

  2. Citric acid

  3. Acrylic acid

  4. Propenoic acid

Show answer
Correct Option: C
Explanation:

Common name of $CH _2=CHCOOH$ is acrylic acid.