Tag: physical properties of alcohols and phenols

Quizzes (0) Questions (19)

Questions Related to physical properties of alcohols and phenols

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

Melting point of phenol is :

  1. $53^0C$
  2. $43^0C$
  3. $33^0C$
  4. $23^0C$
Reveal answer Fill a bubble to check yourself
B Correct answer
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 $43^0C$.

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

Which of the following is not true regarding phenol?

  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
Reveal answer Fill a bubble to check yourself
D Correct answer
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. 

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

Molecular weight of phenol is :

  1. $94.11$
  2. $104.11$
  3. $86.11$
  4. $98$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
Molecular formula of Phenol is $C _6H _5-OH$
Therefore, moelcular weight: $6 (Mass \ of \ Carbon) + 6 (Mass \ of \ Hydrogen)+16 (Mass \ of \ Oxygen)$
$=6 \times 12 + 5 \times 1 + 16 \times 1 + 1 \times 1$
$=94.11$

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

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

  1. red litmus blue

  2. blue litmus red

  3. no change in colour

  4. very slight change in colour from red towards blue
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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

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

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

  1. three

  2. four

  3. five

  4. two
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Hydroxyl group makes the alcohol molecule polar and these are used as protic solvents. Two opposing solubility trends in alcohols are the tendency of the polar OH to promote solubility in water and the tendency of the carbon chain to resist it. So, methanol, ethanol, propanol are miscible in water as the OH group overcomes the short carbon chain.

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

Among the following compounds, the most acidic is:

  1. p-nitrophenol

  2. o-hydroxybenzoic acid

  3. p-toluic acid

  4. p-hydroxybenzoic acid
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Order of strength is ortho hydroxy benzoic acid > Toulic acid > p-hydroxy benzoic acid > p nitro phenol. Ortho hydroxy acid is strongest acid due to stabilisation conjugate by intermolecular H-bond which outweigh the electron donating resonance effect of –OH

 

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

In which of the following solvents, KI has highest solubility? The dielectric constant $(\epsilon)$ of each liquid is given in parentheses.

  1. $ C _{6}H _{6}(\epsilon =0)$
  2. $(CH _{3}) _{2}CO(\epsilon =21)$
  3. $CH _{3}OH(\epsilon =32)$
  4. $CCl _{4}(\epsilon =0)$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

KI is an ionic compound. Hence, it will be most soluble in apolar solvent, which has a high value of dielectric constant. Hence, $CH _3OH$ with the highest value of dielectric constant among the given options will provide high solubility.

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

Phenol is an organic compound even though it is soluble in water due to the presence of:

  1. ionic bonding

  2. covalent bonding

  3. hydrogen bonding

  4. coordinate bonding
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Phenol is an organic compound even though it is soluble in water due to the presence of hydrogen bonding. Phenol has hydroxyl group which is involved in the formation of hydrogen bonds with water. It increases the solubility.  Hydrogen bonding is possible when $H$ atom is attached to electronegative $N,\ O$ or $F$ atom.