Tag: uses of alcohols

Questions Related to 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 $P{Cl} _{5}$

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 $ZnO+Cr _2O _3$

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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}$