Tag: nomenclature of carboxylic acids

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

$C _nH _{2n-1}COOH$ is the general formula for:

  1. saturated fatty acids

  2. unsaturated fatty acids

  3. simple lipids

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

$C _nH _{2n-1}COOH$ is a general formula for unsaturated fatty acids.

For example: $CH _2=CH-COOH$
Propenoic acid $C _2H _3COOH$
$C _nH _{2n+1}COOH$ is general formula for saturated fatty acids.
For example: $CH _3COOH$ is Ethanoic acid.

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

The correct structural formula of butanoic acid is

  1. $H-\overset{H}{\overset{|}{\underset{H}{\underset{|}{C}}}}-\overset{H}{\overset{|}{C}}=\overset{H}{\overset{|}{C}}-\overset{O}{\overset{||}{C}}-OH$
  2. $H-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{O}{\overset{||}{C}}}}-OH$
  3. $H-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-OH$
  4. $H-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\overset{O}{\overset{||}{C}}-OH$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
Butanoic acid is a carboxylic acid with the structural formula CH3CH2CH2-COOH. where $-COOH$ is the functional group.

$H-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\underset{H}{\underset{|}{\overset{H}{\overset{|}{C}}}}-\overset{O}{\overset{||}{C}}-OH$

So, the correct representation of butanoic acid is $D$
Multiple choice chemistry chemical reactions of organic compounds alkanoic acids nomenclature of carboxyl group nomenclature of carboxylic acids

The functional group present in carboxylic acids is ?

  1. -COOH

  2. -CO-

  3. -OH

  4. -CHO
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Carboxylic acids are represented by -COOH- functional group. It ionizes to give carboxylate ions and hydrogen ions. This group present in a compound makes it an acid and if present with other groups in the compound it is always present at position no.1 and carbon is included in the carbon chain atoms.