Tag: chemical reactions of organic compounds

Questions Related to chemical reactions of organic compounds

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

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

  1. saturated fatty acids

  2. unsaturated fatty acids

  3. simple lipids

  4. phospholipids

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Correct Option: B
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.

The correct structural formula of butanoic acid is

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

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

Show answer
Correct Option: D
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 $D$

The functional group present in carboxylic acids is ?

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

  1. -COOH

  2. -CO-

  3. -OH

  4. -CHO

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Correct Option: A
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.

The general formula of carboxylic acids is:

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

  1. $C _{n}H _{n}COOH$

  2. $C _{n}H _{2n}COOH$

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

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

Show answer
Correct Option: D
Explanation:

General formula of acids is: $C _{n}H _{2n+1}COOH$.

For example: for n=1 we get $CH _3-COOH$ which is acetic acid.

IUPAC name of $CH _3COOH$ is:

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

  1. acetic acid

  2. formic acid

  3. methanoic acid

  4. ethanoic acid

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Correct Option: D
Explanation:

It has 2 carbon atoms, and functional group is carboxylic group,suffix is "oic acid"
 thus IUPAC name is Ethanoic acid

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

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

  1. Hydrocarbons

  2. Hydrogen

  3. Water

  4. Hydroxide

  5. Hydrogen peroxide

Show answer
Correct Option: C
Explanation:

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

Petrol engine gives off gaseous oxides of :

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

  1. sulphur

  2. phosphorus

  3. carbon

  4. nitrogen

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Correct Option: D
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.

Burning of coal and diseal releases:

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

  1. $NO _2$

  2. $SO _2$

  3. $CO _2$

  4. None of these

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Correct Option: A,B,C
Explanation:

Burning of coal and diesel release, sulphur dioxide gas, which is extremely corrosive and suffocating in nature.

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

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

  1. LPG

  2. CNG

  3. butimen

  4. coal

Show answer
Correct Option: B
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.

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

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

  1. respiration

  2. combustion

  3. explosion

  4. conduction

Show answer
Correct Option: B
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