Tag: some commercially important alcohols

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Questions Related to some commercially important alcohols

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.

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

Which of the following statements is not correct about methanol?

  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.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
Multiple choice chemistry chemical reactions of organic compounds commercially important alcohols - methanol methanol some commercially important alcohols uses of alcohols

Methanol can be distinguished from ethanol by the following except :

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

  3. Reaction with Lucas reagent

  4. Boiling point
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lucas reagent differentiates between primary, secondary, and tertiary alcohols based on their reaction rates, but methanol and ethanol both react sluggishly or similarly under standard room conditions, making Lucas reagent ineffective for distinguishing them. The other methods, such as the iodoform test and boiling points, successfully differentiate methanol from ethanol.

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

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

  1. methanol

  2. methanoic acid

  3. methanal

  4. ethanoic acid
Reveal answer Fill a bubble to check yourself
A Correct answer
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.