Tag: hydroxy compounds and ethers

Questions Related to hydroxy compounds and ethers

The compound which gets dissolved in water is :

chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. $C _{2}H _{6}$

  2. $C _{2}H _{4}$

  3. $C _{2}H _{2}$

  4. $C _{2}H _{5}OH$

  5. $C _{3}H _{8}$

Show answer
Correct Option: D
Explanation:

Option D or Ethanol dissolves in water. 


Ethanol has electronegative oxygen atom in it, and hence it takes part in hydrogen bonding with water. 

Because of excessive hydrogen bonding with water, Ethanol dissolves in it.

Which of the following cannot be dissolved in alcohol?

chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. Dyes and drugs

  2. Soaps and varnishes

  3. Resins and varnishes

  4. Rubber and plastics

Show answer
Correct Option: D
Explanation:

Rubber and plastic cannot be dissloved in alchol because of nonpolar nature of rubber and plastics

Which of the following has a higher boiling point?

chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. Butanol

  2. Butanal

  3. Both of them have similar boiling point

  4. Cannot say anything 

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Correct Option: A
Explanation:

There is a large difference between boiling points of butanol and butanal, although they have almost the same solubility in water. Butanol contains -OH group and can form hydrogen bonds. Hence, the molecules are associated. A large amount of energy is required to break the association. Hence, butanol has a higher boiling point. Hydrogen bonding is not possible in butanal.

Solubility of alcohols in water is _______ to that of hydrocarbons of comparable molecular masses.

chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. greater than

  2. similar

  3. lesser than

  4. none of these

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Correct Option: A
Explanation:
Since alcohols can participate in $H-$bonding while hydrocarbons cannot, alcohols are able to interact with water molecules more easily than hydrocarbons of comparable molecular masses. Hence alcohols possess greater solubility in water than hydrocarbons of comparable molecular masses.
Lower alcohols are more soluble in water than higher alcohols.
chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. True

  2. False

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Correct Option: A
Explanation:

Lower alcohols are more soluble in water than higher alcohols. With the increase in the molar mass, solubility decreases. In alcohols, $-OH$ group is polar and forms hydrogen bonds with water. This makes alcohol water soluble. The alkyl chain (hydrocarbon chain) is non-polar and decreases the solubility of alcohol in water.

Alcohols containing only up to ________________ carbon atoms are completely miscible with water.

chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. 10

  2. 3

  3. 8

  4. 14

Show answer
Correct Option: B
Explanation:

 Alcohol-containing up to $3-$ carbon atoms are completely miscible with water in all proportions. This is due to the hydrogen bonding with water molecule. 

Melting point of phenol is :

chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. $53^0C$

  2. $43^0C$

  3. $33^0C$

  4. $23^0C$

Show answer
Correct Option: B
Explanation:

Pure phenols are generally colorless solids or liquids. Phenols (molecular weight $=94$) have the relatively low melting point. So generally exist in liquid form above room temperature.

its melting point is $43^0C$.

Which of the following is not true regarding phenol?

chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. Pure phenol is a white crystalline solid

  2. Phenol smell as disinfectant.

  3. It causes immediate white blistering to the skin

  4. None of these

Show answer
Correct Option: D
Explanation:

Pure Phenols are colorless solids or liquids. These are used as disinfectant due to their chemical properties. Also, because of its acidic nature, it causes immediate white blistering to the skin. 

Molecular weight of phenol is :

chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. $94.11$

  2. $104.11$

  3. $86.11$

  4. $98$

Show answer
Correct Option: A
Explanation:
Molecular formula of Phenol is $C _6H _5-OH$
Therefore, moelcular weight: $6 (Mass \ of \ Carbon) + 6 (Mass \ of \ Hydrogen)+16 (Mass \ of \ Oxygen)$
$=6 \times 12 + 5 \times 1 + 16 \times 1 + 1 \times 1$
$=94.11$

The major product of Raschig process was taken for litmus test.It was observed that it turned:

chemistry hydroxy compounds and ethers physical properties of phenol physical properties of alcohols and phenols organic compounds with functional group containing oxygen (part-1)

  1. red litmus blue

  2. blue litmus red

  3. no change in colour

  4. very slight change in colour from red towards blue

Show answer
Correct Option: B
Explanation:

Phenol is obtained as the major product of Raschig process.Phenol is mildly acidic in nature so it turns blue litmus red.