Tag: chemical reactions of organic compounds

Questions Related to chemical reactions of organic compounds

 $C _3H _8 + 5O _2\rightarrow  3CO _2 + H _2O$

Name the type of reaction.

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

  1. Substitution

  2. Combustion

  3. Hydrogenation

  4. Displacement

Show answer
Correct Option: B
Explanation:

The reaction $\displaystyle C _3H _8 + 5O _2\rightarrow  3CO _2 + H _2O$ is an example of combustion reaction. Propane on complete combustion in  presence of excess oxygen gives carbon dioxide and water.

LPG has a lower energy density than either petrol or fuel-oil, so the equivalent  ______ is higher.

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

  1. fuel-consumption

  2. fuel-absorption

  3. fuel density

  4. fuel capacity

Show answer
Correct Option: A
Explanation:

LPG has a lower energy density than either petrol or fuel-oil, so the equivalent fuel-consumption is higher.
Lower energy density means lesser amount of energy is released during combustion of unit mass of fuel. Hence, to obtain certain quantity of fuel more fuel should be combusted.

LPG can be used as a power source for :

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

  1. combined heat and power technologies (CHP)

  2. combined heat and energy technologies ( CHP)

  3. combined heat and coal technologies (CHP)

  4. heat and power technologies

Show answer
Correct Option: A
Explanation:

LPG can be used as a power source for combined heat and power technologies (CHP).
Combined  heat and power (CHP) is the simultaneous generation of electricity and useful heating from the combustion of a fuel. It is a thermodynamically efficient use of fuel.

Statement 1 : When a hydrocarbon is combusted in air, carbon monoxide is the major product.
Statement 2 : Air contains much more nitrogen than oxygen.

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

  1. Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  2. Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

  3. Statement 1 is correct but Statement 2 is not correct.

  4. Statement 1 is not correct but Statement 2 is correct.

  5. Both the Statement 1 and Statement 2 are not correct.

Show answer
Correct Option: D
Explanation:

Statement 1 : When a hydrocaron is combusted in air, $CO _2$ is the major product whereas the $CO$ is produced if there is incomplete combustion of some hydrocarbon.
Statement 2: Air contains much more nitrogen than air.
$N _2= 78$%
$O _2 = 21$%

Which of the following statements is not correct about methanol?

chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

  1. It is used for drinking purposes.

  2. It is highly poisonous compound.

  3. It can be prepared by reduction of formaldehyde with $LiAlH _4$

  4. It is miscible with water in all proportions.

Show answer
Correct Option: A
Explanation:
Methanol can not be used for drinking purposes as it is highly poisonous compound.
It can be prepared by reduction of formaldehyde with $LiAlH _4$ as :
$HCHO+LiAlH _4 \rightarrow CH _3OH$
It can form hydrogen bond with water and that makes it miscible with water in all proportion.

Methanol can be distinguished from ethanol by the following except :

chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

  1. Reaction with iodine and alkali

  2. Reaction with salicylic acid and ${ H } _{ 2 }{ SO } _{ 4 }$

  3. Reaction with Lucas reagent

  4. Boiling point

Show answer
Correct Option: A

The organic compound which when mixed with ethyl alcohol, [ethanol], makes a spurious is:

chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

  1. methanol

  2. methanoic acid

  3. methanal

  4. ethanoic acid

Show answer
Correct Option: A
Explanation:

Alcohol is used in large qualities to produce alcoholic ilquiors or beverages throughout the world. Excessive drinking of it damages kidney and produces other vices. So, to refrain people from drinking it, government controls its production and supply . This is done by making it unfit for drinking by addituion of poisonous, substances like methanol, action, pyridine, $CuSO _4.$ It is called methylated spirit/denatured alcohol. 

Methyl alcohol is treated with conc HI and red P. The main product obtained is ?

chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

  1. $CH _3OH$

  2. $CH _4$

  3. $CH _2I _2$

  4. $PH _3$

Show answer
Correct Option: B
Explanation:
$HI$/Red P is one of the strongest reducing agents. So, it reduces all functional groups to yield alkanes. Hence, methanol gives methane.
$CH _{3}OH \, \overset{HI/Red\, P}\rightarrow \,CH _{4}$

Which of the following is wood alcohol?

chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

  1. $\displaystyle CH _{3}OH$

  2. $\displaystyle C _{2}H _{5}OH$

  3. 1-Butanol

  4. 2-Methyl -1-propanol

Show answer
Correct Option: A
Explanation:

Methanol, also known as methyl alcohol, wood alcohol, wood naphtha, methyl hydrate, or wood spirits, is a chemical with the formula CH₃OH.


Methanol acquired the name wood alcohol because it was once produced chiefly by the destructive distillation of wood

Hence, the correct option is $\text{A}$

Carbinol is a trivial name of :-

chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

  1. $\displaystyle { C } _{ 2 }{ H } _{ 5 }OH$

  2. $\displaystyle { CH } _{ 3 }OH$

  3. $\displaystyle HCOOH$

  4. $\displaystyle { CH } _{ 3 }COOH$

Show answer
Correct Option: B
Explanation:

Carbinol is a trivial name of methanol $CH _3OH$.