Tag: chemical reactions of organic compounds

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Questions Related to chemical reactions of organic compounds

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.

Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

When most fuels burn, the products include carbon dioxide and X. What is X?

  1. Hydrocarbons

  2. Hydrogen

  3. Water

  4. Hydroxide

  5. Hydrogen peroxide
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

When most fuels burn, the products include carbon dioxide and water.
Fuels are hydrocarbons. Combustion of hydrocarbons releases carbon dioxide and water.
$\displaystyle  CH _4 + 2O _2 \rightarrow CO _2 + 2H _2O$

Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

Petrol engine gives off gaseous oxides of :

  1. sulphur

  2. phosphorus

  3. carbon

  4. nitrogen
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Petrol engine gives off gaseous oxides of nitrogen.
During combustion of fuel at high temperature, nitrogen and oxygen of air combine to form $NO$ and $\displaystyle NO _2$ and are released with the exhaust gas.

Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

Use of petrol and diseal as fuel in automobiles are now replaced by :

  1. LPG

  2. CNG

  3. butimen

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

Use of petrol and diseal as fuel in automobiles are now replaced by CNG.
CNG is compressed natural gas (methane stored at high pressure).
Combustion of CNG results in fewer unwanted gases than petrol and diseal.
Also CNG is safer than petrol and diseal as CNG is lighter than air and disperses quickly when released.

Multiple choice chemistry chemical reactions of organic compounds combustion and thermal cracking of hydrocarbons chemical properties of carbon compounds chemical properties of organic compounds

A chemical process in which a substance reacts with oxygen to give off heat is______?

  1. respiration

  2. combustion

  3. explosion

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

A chemical process in which a substance reacts with oxygen to give off heat is combustion.
For example, when C is burnt in excess air, it gives carbon dioxide and heat.
$\displaystyle C + O _2 \rightarrow CO _2 + $ heat