Tag: chemistry

Questions Related to chemistry

Methanol is called as Marine Methanol beacuse:

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

  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

Show answer
Correct Option: C
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.

The other name for Syngas is:

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

  1. Producer gas

  2. Water gas

  3. Tear gas

  4. Fuel gas

Show answer
Correct Option: B
Explanation:

Syngas is also called as water gas which is a mixture of carbon monoxide and hydrogen.

Trivial name of methanol is _________ .

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

  1. wood spirit

  2. methyl alcohol

  3. wood alcohol

  4. all of the above

Show answer
Correct Option: D
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.

From methyl alcohol we get:

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

  1. bakelite, a hard plastic

  2. the rubber neoprene

  3. the plastic perspex

  4. sponge rubber

Show answer
Correct Option: A
Explanation:

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

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

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

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

  1. methyl alcohol

  2. ethyl alcohol

  3. ethyl alcohol + water

  4. methyl alcohol + water

Show answer
Correct Option: C,D
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.

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 $P{Cl} _{5}$

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

  1. $b\ d\ e\ c\ f\ a$

  2. $b\ d\ c\ a\ f\ e$

  3. $b\ f\ d\ e\ a\ c$

  4. $d\ b\ c\ e\ f \ a$

Show answer
Correct Option: A
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 $KOH$
$CaC _2 + 2 H _2O\rightarrow C _2H _2 + Ca(OH) _2 \Rightarrow C _2H _2  + H _2SO _4/ HgSO _4 \rightarrow CH _3CHO
 \Rightarrow CH _3CHO + H _2SO _4\rightarrow CH _3COOH \Rightarrow CH _3COOH + NaOH + CaO \rightarrow CH _3COONa
 \Rightarrow CH _3COONa + PCl _5 \rightarrow CH _3Cl\Rightarrow CH _3Cl + KOH \rightarrow CH _3OH$

Reagent used for the industrial preparation of methanol from $CO$ and $H _2$ is:

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

  1. mixture of $ZnO+CuO$

  2. mixture of $CuO+Cr _2O _3$

  3. mixture of $Zn _O+CaO$

  4. mixture of $ZnO+Cr _2O _3$

Show answer
Correct Option: A

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

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

  1. partial oxidation of hydrocarbons

  2. reacting $H _2$ with $CO$

  3. reacting $H _2$ with $CO _2$

  4. All the above

Show answer
Correct Option: D
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.

An industrial method for the preparation of methanol is:

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

  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 $NaOH$

Show answer
Correct Option: A
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}$

Which of the following does not yield wool?

chemistry animal fibre wool - animal fibre wool fibres from animals

  1. Yak

  2. Camel

  3. Goat

  4. Woolly dog

Show answer
Correct Option: D
Explanation:

Yak, Camel, and Goat all yield wool.

Woolly dog does not yield wool