Tag: carbon and its compounds

Questions Related to carbon and its compounds

The phenomenon of existence of an element in more than one physical form is called allotropy.
chemistry carbon and its compounds organic compounds allotropes of carbon versatile nature of carbon

  1. True

  2. False

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Correct Option: A
Explanation:

Allotropy or allotropism is the property of some chemical elements to exist in two or more different forms, known as allotropes of these elements.

Example : Graphite and diamond

Which out of the following has smell similar to that of vinegar?

chemistry carbon and its compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. Methanol

  2. Ethanol

  3. Ethanoic acid

  4. Formic acid

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Correct Option: C
Explanation:

Vinegar is a liquid having acetic acid and water as its mixture. So, ethanoic acid is the other name of acetic acid and this smell of vinegar is similar to ethanoic acid. 

Ethanol is:

chemistry carbon and its compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. ionic compound

  2. noble gas

  3. polar covalent compound

  4. non-polar covalent compound

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Correct Option: C
Explanation:

Ethanol can be written as $CH _3-CH _2-OH$. The oxygen atom in the hydroxyl ($OH$) group is highly electronegative and hence attracts the electrons towards itself. Thus, ethanol is a polar compound with its electrons more towards the oxygen atom. Although ($C _2H _5$) group is non polar.

All the bonds in ethanol are covalent in nature. The bonds are formed by sharing of electrons between the atoms.
Thus, option $C$ is the correct answer.

Which method is used to get pure ethanol?

chemistry carbon and its compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. Membrane technology

  2. Esterification

  3. Fermentation

  4. None of these

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Correct Option: D
Explanation:

In industrial method, to obtain 100% pure alcohol, a small quantity of benzene is added to rectified spirit and the mixture is then distilled. Absolute alcohol is obtained in third fraction that distills over at 78.2°C (351.3 K).

None of the given method is correct. 

Option D is the answer.