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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.

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

Trivial name of methanol is _________ .

  1. wood spirit

  2. methyl alcohol

  3. wood alcohol

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

Methanol is known as methyl alcohol, wood alcohol, wood naphtha or wood spirit because it was once produced 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

From methyl alcohol we get:

  1. bakelite, a hard plastic

  2. the rubber neoprene

  3. the plastic perspex

  4. sponge rubber
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Solution:- (A) bakelite, a hard plastic.

Explanation:-
Methyl alcohol on reaction with formaldehyde at room temperature and pressure gives bakelite.

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

The compound (s) used as an antifreeze in radiators of automobiles is/are?

  1. methyl alcohol

  2. ethyl alcohol

  3. ethyl alcohol + water

  4. methyl alcohol + water
Reveal answer Fill a bubble to check yourself
C,D Correct answer
Explanation

Anitfreeze agents work to prevent the vehicle from overheating in summers and freezing in winters. The anifreeze agents used are ;ethyl alcohol + water and methyl alcohol + water.

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

Identify the correct sequence of given steps for the conversion of calcium carbide to methyl alcohol.
(a) Reaction with aqueous $KOH$
(b) Hydrolysis
(c) Reaction with soda lime
(d) Reaction with $Ha{SO} _{4}/{H} _{2}{SO} _{4}$
(e) Reaction with $Hg{SO} _{4}$
(f) Reaction with $P{Cl} _{5}$

  1. $b\ d\ e\ c\ f\ a$
  2. $b\ d\ c\ a\ f\ e$
  3. $b\ f\ d\ e\ a\ c$
  4. $d\ b\ c\ e\ f \ a$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Steps for the conversion of calcium carbide to methyl alcohol:
(b) Hydrolysis
(d) Reaction with $Ha{SO} _{4}/{H} _{2}{SO} _{4}$
(e) Reaction with $Hg{SO} _{4}$
(c) Reaction with soda lime
(f) Reaction with $P{Cl} _{5}$
(a) Reaction with aqueous $KOH$
$CaC _2 + 2 H _2O\rightarrow C _2H _2 + Ca(OH) _2 \Rightarrow C _2H _2  + H _2SO _4/ HgSO _4 \rightarrow CH _3CHO
 \Rightarrow CH _3CHO + H _2SO _4\rightarrow CH _3COOH \Rightarrow CH _3COOH + NaOH + CaO \rightarrow CH _3COONa
 \Rightarrow CH _3COONa + PCl _5 \rightarrow CH _3Cl\Rightarrow CH _3Cl + KOH \rightarrow CH _3OH$

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

Under suitable condition temperature,pressure and catalyst,methanol can be obtain by:

  1. partial oxidation of hydrocarbons
  2. reacting $H _2$ with $CO$
  3. reacting $H _2$ with $CO _2$

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

Partial oxidation of hydrocarbons produces methanol.

$CO + 2H _2O \longrightarrow CH _3OH$
$CO _2 + H _2O \longrightarrow CH _3OH + H _2O$
All the three processes produces mathanol.

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

An industrial method for the preparation of methanol is:

  1. by catalytic reduction of carbon monoxide

  2. by reacting methane with steam in presence of a catalyst
  3. by reduction of $HCHO$ with $LiAlH _4$
  4. by reduction of $HCHO$ with aqueous $NaOH$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An industrial method for the preparation of methanol is by catalytic reduction of carbon monoxide.
$ \displaystyle \underset {  \displaystyle  \text { Synthetic gas } }{\underset {  \displaystyle  \text { water gas } }{CO+H _2}+H _2} \xrightarrow [ \text { 300 deg C, pressure }]{Cr _2O _3-ZnO} \underset {  \displaystyle  \text { Methanol } }{CH _3-OH}$