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 commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

$(CO+H _{2})+H _{2}\overset {673k,300atm,/Cr _{2}O _{3}-ZnO} {\rightarrow}$ 
The above shown reaction may by used for manufacture of:

  1. $HCHO$
  2. $CH _{3}COOH$
  3. $HCOOH$
  4. $CH _{3}OH$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Methanol is prepared on an industrial scale from a mixture of CO and H2. The mixture is subjected to 200atm pressure and passed over ZnO and Cr2O3 catalyst at 400 to 450 degrees celsius.

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

Hydrolysis of an ester gives acid A and alcohol B. The acid reduces Fehlings solution. Oxidation of alcohol B gives acid A. The ester is:

  1. Mehthyl formate

  2. Ethyl formate

  3. Methyl acetate

  4. Ethyl acetate
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A
A:- HCOOH
B:- $CH _{3}OH$
Therefore the ester is $HCOOCH _{3}$

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

Methanol is now prepared from:

  1. water gas

  2. sugar through fermentation

  3. wood
  4. both $A$ and $B$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
On an industrial scale, methanol is predominantly produced from natural gas by reforming the gas with steam and then converting and distilling the resulting synthesized gas mixture to create pure methanol. The result is a clear, liquid, organic chemical that is water-soluble and readily biodegradable.
Some methanol can be produced during fermentation, but this is not derived from the ethanol or by carbohydrate oxidation. It is produced in small amounts, either by non-enzymatic reactions or through the reduction of formaldehyde.
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.