Tag: some commercially important alcohols

Questions Related to some commercially important 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 $ZnO+Cr _2O _3$

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}$