Tag: commercially important alcohols - methanol

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Questions Related to commercially important alcohols - methanol

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

Which among the following reactions does not give methyl alcohol?

  1. The reaction of ethylene with ${H} _{2}{SO} _{4}$ at ${80}^{o}C$

  2. The reaction of water gas with hydrogen at high temperature

  3. Alkaline hydrolysis of methyl bromide
  4. Both $A$ and $B$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The reaction of ethylene with ${H} _{2}{SO} _{4}$ at ${80}^{o}C$ gives ethyl hydrogensulphate.
$CH _2=CH _2+H _2SO _4 \rightarrow CH _3CH _2OSO _2OH$
Water gas (carbon monoxide and hydrogen) at high temperature gives methanol.
$CO + 2H _2 \rightarrow CH _3OH$.
Alkaline hydrolysis of methyl bromide gives methanol 
$CH _3Br + H _2O \rightarrow CH _3OH + HBr$

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

Methanol can be prepared when :

  1. iodomethane is heated with moist silver oxide

  2. iodomethane react with sodium in the presence of ether

  3. both A and B

  4. none of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Moist Silver oxide 
$Ag _2O + H _2O \rightarrow 2AgOH$
$CH _3-I + AgOH \rightarrow CH _3-OH + AgI$
Therefore, methanol can be prepared when iodomethane is heated with moist silver oxide. 
Multiple choice chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

There are two samples $A$ and $B$. $A$ is Methanol and $B$ is Ethanol. Both are heated both at the same rate in closed container separately. Which one is correct about the above test?

  1. At $60^0$C, container $A$ and $B$ both have liquids in them
  2. At $80^0$C, container $A$ and $B$ both have vapours in them
  3. At $70^0$C, container $B$ has liquid and $A$ has vapours

  4. All the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Methanol has a boiling point of $64.7^0$C whereas ethanol has a boiling point of $78.24^0$C. So, all the statements are correct.

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

Identify the correct set representing properties of Methanol.

  1. Colourless, volatile, poisonous, miscible

  2. Colourless, volatile, non-poisonous, miscible

  3. Colourless, volatile, poisonous, immiscible

  4. Colourless, non-volatile, poisonous, miscible
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Methanol is a light, volatile, colorless, miscible, flammable liquid with a distinctive odor very similar to that of ethanol (drinking alcohol).

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

Destructive distillation of wood in the laboratory will result in the formation of :

  1. Ethanol

  2. Methane

  3. Methanol

  4. Butane
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Methanol acquired the name "wood spirit" because it was once produced chiefly as a byproduct of the destructive distillation of wood.

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

Methanol is never stored in aluminium vessel because:

  1. it reacts with aluminium forming toxic gas

  2. it results in explosion

  3. it corrodes the the metal by destroying its oxide layer

  4. aluminium reduces methanol to methane
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Aluminum and its alloys resist most alcohols, however, some alcohols like methanol can be very corrosive when  extremely dry, especially at elevated temperatures.

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

Which of the following does NOT involve application of Methanol?

  1. As a solvent

  2. As an anti-freeze in pipelines

  3. In consumable liquor

  4. In Windshield washer fluid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Methanol is toxic in nature and very unfit for drinking purposes.Its consumption can lead to early blindness and further causing death.

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

Methanol is called as Marine Methanol beacuse:

  1. it is an essential compound for marine life

  2. it is mostly obtained from deep sea bed

  3. it is used as a marine fuel

  4. it serves as a signal indicator for big ships on burning
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Currently, methanol is being developed and utilized as a marine fuel. Interest in methanol as a ship fuel is growing in response to international regulatory changes and cost advantages relative to other fuels. Methanol is an alternative which is sulphur free, has low emissions; perhaps three to four times cheaper than marine distillate fuel; and has a higher score on the International Martine Organization (IMO) energy efficiency design index (EEDI)than LNG or diesel. Globally, Methanol is already in widespread production (~70 million tons per annum) for a multitude of chemical and energy applications, and is one of the world’s most widely shipped chemicals.