Acidity of Alcohols and Phenols

Q. Which of the following will maximum $p{K}_a$ value?

1. Phenol
2. o-cresol
3. ethanol
4. o-nitrophenol

Q. Which one is the most acidic compound?

1. 
2. 
3. 
4. 

Q. Which of the following statements is/are correct?

1. The conjugate acid of $N{H}_2^{-}$ is $N{H}_3$
2. Solubility product constant increases with increase in concentration of ions
3. On diluting a buffer solution $pH$ change is zero
4. In alkaline buffer solution, if some $HCl$ is added, its $\left[O{H}^{-}\right]$ will increase

Q.

The Increasing Order of acidic Strength of the following is

1. (i) < (ii) < (iii)

2. (iii) < (ii) < (i)

3. (ii) < (iii) < (i)

4. (i) < (iii) < (ii)

Q. Which of the following will not react with $NaOH?$

1. 
   
2. $C_2{H}_{5}OH$
3. $C{H}_{3}CON{H}_2$
4. $CH(CN{)}_3$

Q. The decreasing order of acidic character of the following is:
I. $C{H}_{3}SH$ II. $C{H}_{3}OH$ III. $H_{2}O$ IV. EtOH

1. I > II > III > IV
2. IV > III > II > I
3. I > III > II > IV
4. III > I > II > IV

Q. A solution of m-chloroaniline, m-chlorophenol, m-chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of $NaHC{O}_3$ to give fraction A. The leftover organic phase was extracted with dilute $NaOH$ to give fraction B. The final organic layer was labelled as fraction C. Fractions A, B and C, contain respectively:

1. m-chlorophenol, m-chlorobenzoic acid and m-chloroaniline
2. m-chlorobenzoic acid, m-chlorophenol and m-chloroaniline
3. m-chloroaniline, m-chlorobenzoic acid and m-chlorophenol
4. m-chlorobenzoic acid, m-chloroaniline and m-chlorophenol

Q. Arrange the following in the increasing order of acidity.

1. Phenol
2. Methanol
3. 4-Nitrophenol
4. Isopropanol
5. Tert-butanol

Q.

ClCH₂CH₂OH is stronger acid than CH₃CH₂OH because of:

1. -I effect of Cl increases -ve charge on O atom of alcohol

2. -I effect of Cl disperses -ve charge on O atom to produce more stable cation

3. -I effect of Cl disperses -ve charge on O atom to produce more stable anion

4. None of these

Q.

Which Statement is incorrect?

1. Phenol is Weak acid

2. Phenol is an aromatic compound

3. Phenol liberates Co₂ from NaHCo₃ Solution

4. Phenol is Soluble in NaOH.

Q.

Arrange the following in increasing acidic character
Phenol, m - nitrophenol, m - chlorophenol, m - cresol
I II III IV

1. IV < I < III < II

2. IV < I < II < III

3. I < IV < III < II

4. III < II < IV < I

Q. A solution of m-chloroaniline, m-chlorophenol, m-chlorobenzoic acid in ethyl acetate was extracted initially with a saturated solution of $NaHC{O}_3$ to give fraction A. The leftover organic phase was extracted with dil. $NaOH$ to give fraction B. The final organic layer was labelled as fraction C. Fractions A, B and C contain respectively:

1. m-chlorophenol, m-chlorobenzoic acid and m-chloroaniline
2. m-chlorobenzoic acid, m-chlorophenol and m-chloroaniline
3. m-chloroaniline, m-chlorobenzoic acid and m-chlorophenol
4. m-chlorobenzoic acid, m-chloroaniline and m-chlorophenol

Q.

Phenol is less acidic than [IIT-JEE 1986; UPSEAT 2003; Orissa JEE 2004]

1. Acetic acid

2. p-nitrophenol

3. Both (a) and (b)

4. None of these

Q. The decreasing order of acidic character of the following is:
I. $C{H}_{3}SH$ II. $C{H}_{3}OH$ III. $H_{2}O$ IV. EtOH

1. I > II > III > IV
2. IV > III > II > I
3. I > III > II > IV
4. III > I > II > IV

Q.

When benzene sulphonic acid and p-nitrophenol is treated with NaHCO₃, the gases released respectively are:

1. SO₂, CO₂

2. SO₂, NO

3. SO_{2 ,} NO₂

4. CO₂, CO₂

Q.

The strongest acid among the following aromatic compounds is [NCERT 1978]

1. ortho-nitrophenol

2. para-chlorophenol

3. para-nitrophenol

4. meta-nitrophenol

Q.

Which of the following compounds decomposes NaHCO₃ solution?

1. Phenol

2. 2- nitrophenol

3. Methoxy phenol

4. 2, 4, 6 - trinitro phenol