Tag: commercially important alcohols - ethanol

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Questions Related to commercially important alcohols - ethanol

Multiple choice organic compounds with functional group containing oxygen (part-1) uses of alcohols commercially important alcohols - ethanol some commercially important alcohols

Rectified spirit can be converted into Absolute alcohol by distilling with?

  1. $NaCO _{3}$
  2. $Mg(OC _{2}H _{5}) _{2}$
  3. $CaO$

  4. Both 2 & 3

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the laboratory, Absolute alcohol is prepared by keeping the rectified spirit in contact with calculated amount of quick lime $(CaO)$ for a few hours and then refluxing and distilling it.

Multiple choice organic compounds with functional group containing oxygen (part-1) uses of alcohols commercially important alcohols - ethanol some commercially important alcohols

Power alcohol is:

  1. absolute alcohol : petrol (20:80)

  2. absolute alcohol : petrol (80:20)

  3. rectified spirit : benzene (20:80)

  4. rectified spirit : benzene (80:20)
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Power alcohol is 20 : 80 mixture of absolute alcohol and petrol.
It is used to generate power.
Power alcohol is an additive to motor fuels to act as fuel for internal combustion engine.

Multiple choice organic compounds with functional group containing oxygen (part-1) uses of alcohols commercially important alcohols - ethanol some commercially important alcohols

Absolute alcohols (100% ethanol) are prepared from rectified spirit (95% ethanol) by mixing a suitable amount of ............... and subjected to fractional distillation (azeotropic distillation).

  1. Toluene

  2. o-Xylene

  3. Methanol

  4. Benzene
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Absolute alcohols (100% ethanol) are prepared from rectified spirit (95% ethanol) by mixing a suitable amount of benzene and subjected to fractional distillation (azeotropic distillation).

Multiple choice organic compounds with functional group containing oxygen (part-1) uses of alcohols commercially important alcohols - ethanol some commercially important alcohols

Absolute alcohol can be prepared from rectified spirit by _____ distillation.

  1. vacuum

  2. fractional

  3. azeotropic

  4. none of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Absolute alcohol can be prepared from rectified spirit by azeotropic distillation. Absolute alcohol is 100% pure alcohol. Rectified spirit contains 95.87% ethanol and 4.13% water. It is a constant boiling mixture having boiling point 78.13 $^oC$.

Multiple choice organic compounds with functional group containing oxygen (part-1) uses of alcohols commercially important alcohols - ethanol some commercially important alcohols

Identify the odd one out from the following.

  1. Chloroform

  2. Formaldehyde

  3. Methyl chloride

  4. Methylated spirit
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Denatured alcohol, also called methylated spirits or denatured rectified spirit, is ethanol that has additives to make it poisonous. Rest are made from methane.

Multiple choice organic compounds with functional group containing oxygen (part-1) uses of alcohols commercially important alcohols - ethanol some commercially important alcohols

Which of the following is used to get absolute alcohol from rectified spirit?

  1. $CaO$
  2. $Ca$
  3. $Ca{CO} _{3}$
  4. ${P} _{2}{O} _{5}$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A rectified spirit is a mixture with a composition of ethanol (95%) and water (5%). Using quicklime $(CaO)$ to absorb water content and finally contacting the solution with anhydrous copper sulphate removes the leftover traces of water that leaves absolute alcohol. 

Multiple choice organic compounds with functional group containing oxygen (part-1) uses of alcohols commercially important alcohols - ethanol some commercially important alcohols

Methylated spirit is ethanol containing methanol to render it unfit for drinking.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Methylated spirit is $10\%$ methanol and $90\%$ ethanol which is denatured alcohol used as a solvent and as fuel which is not fit for drinking as it is highly toxic in nature.