Tag: alkanoic acids

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Questions Related to alkanoic acids

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

  1. $C _6H _5COONa$
  2. $HCOONa$
  3. $CH _3COONa$
  4. $Na _2C _2O _4$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Sodium oxalate (Na2C2O4) reacts with H2SO4 to release CO/CO2, and with CaCl2 to form calcium oxalate (white precipitate). Calcium oxalate is then oxidized by KMnO4 in acidic medium.

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

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

  1. glycoxal

  2. lactic acid

  3. glycine

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

The given compound is Lactic acid.

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

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

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

  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. $(HOOC)CH _2CH _2C(COOH)(OH)CH _2(COOH)$
Reveal answer Fill a bubble to check yourself
A Correct answer
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 $(HOOC)CH _2C(COOH)(OH)CH _2(COOH)$
Multiple choice chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

Which of the following statements is/are correct?

  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
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
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.
Multiple choice chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

Structure of ethanoic acid is:

  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. $\displaystyle CH _3 - CH _2- NH _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $-COOH$.