Tag: some commercially important alcohols

Questions Related to some commercially important alcohols

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)

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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.

Which of the following statements is not correct about methanol?

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

  1. It is used for drinking purposes.

  2. It is highly poisonous compound.

  3. It can be prepared by reduction of formaldehyde with $LiAlH _4$

  4. It is miscible with water in all proportions.

Show answer
Correct Option: A
Explanation:
Methanol can not be used for drinking purposes as it is highly poisonous compound.
It can be prepared by reduction of formaldehyde with $LiAlH _4$ as :
$HCHO+LiAlH _4 \rightarrow CH _3OH$
It can form hydrogen bond with water and that makes it miscible with water in all proportion.

Methanol can be distinguished from ethanol by the following except :

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

  1. Reaction with iodine and alkali

  2. Reaction with salicylic acid and ${ H } _{ 2 }{ SO } _{ 4 }$

  3. Reaction with Lucas reagent

  4. Boiling point

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Correct Option: A

The organic compound which when mixed with ethyl alcohol, [ethanol], makes a spurious is:

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

  1. methanol

  2. methanoic acid

  3. methanal

  4. ethanoic acid

Show answer
Correct Option: A
Explanation:

Alcohol is used in large qualities to produce alcoholic ilquiors or beverages throughout the world. Excessive drinking of it damages kidney and produces other vices. So, to refrain people from drinking it, government controls its production and supply . This is done by making it unfit for drinking by addituion of poisonous, substances like methanol, action, pyridine, $CuSO _4.$ It is called methylated spirit/denatured alcohol.