Tag: commercially important alcohols - ethanol

Questions Related to commercially important alcohols - ethanol

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

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

  1. $NaCO _{3}$

  2. $Mg(OC _{2}H _{5}) _{2}$

  3. $CaO$

  4. Both 2 & 3 

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Correct Option: C
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.

Power alcohol is:

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

  1. absolute alcohol : petrol (20:80)

  2. absolute alcohol : petrol (80:20)

  3. rectified spirit : benzene (20:80)

  4. rectified spirit : benzene (80:20)

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Correct Option: A
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.

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

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

  1. Toluene

  2. o-Xylene

  3. Methanol

  4. Benzene

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Correct Option: D
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).

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

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

  1. vacuum

  2. fractional

  3. azeotropic

  4. none of these

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Correct Option: C
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 $^oC$.

Identify the odd one out from the following.

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

  1. Chloroform

  2. Formaldehyde

  3. Methyl chloride

  4. Methylated spirit

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Correct Option: D
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.

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

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

  1. $CaO$

  2. $Ca$

  3. $Ca{CO} _{3}$

  4. ${P} _{2}{O} _{5}$

Show answer
Correct Option: A
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. 

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

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

  1. True

  2. False

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Correct Option: A
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.