NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323256
Which one of the following properties is exhibited by phenol?
1 It is soluble in aq. \(\mathrm{NaOH}\) and evolves \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
2 It is soluble in aq. \(\mathrm{NaOH}\) and does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
3 It is not soluble in aq. \(\mathrm{NaOH}\) but evolves \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
4 It is insoluble in aq. \(\mathrm{NaOH}\) and does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
Explanation:
Phenol is soluble in aq. \(\mathrm{NaOH}\) forming sodium phenoxide. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}+\mathrm{NaOH} \rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{ONa}+\mathrm{H}_{2} \mathrm{O}\) But phenol does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\) and aq. \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) because phenol is weaker acid than carbonic acid.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323257
Which one of the following properties is exhibited by phenol?
1 It is soluble in \({\rm{aq}}\,\,{\rm{NaOH}}\) and evolves \({\rm{C}}{{\rm{O}}_{\rm{2}}}\,{\rm{with}}\,{\rm{aq}}\,{\rm{NaHC}}{{\rm{O}}_{\rm{3}}}\)
2 It is soluble in \({\rm{aq}}{\rm{.NaOH}}\) and does not evolve \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{with}}\,{\rm{aq}}\,{\rm{.NaHC}}{{\rm{O}}_{\rm{3}}}\)
3 It is not soluble in \({\rm{aq\,NaOH}}\) but evolves \({\rm{C}}{{\rm{O}}_{\rm{2}}}\,{\rm{with}}{\mkern 1mu} \,{\rm{aq}}{\mkern 1mu} \,{\rm{NaHC}}{{\rm{O}}_{\rm{3}}}\)
4 It is insoluble in \({\text{aq}}\,\,{\text{NaOH}}\,\,{\text{but}}\,{\text{does}}\,{\text{not}}\,{\text{evolve C}}{{\text{O}}_{\text{2}}}\,{\text{with}}{\mkern 1mu} \,{\text{aq}}{\text{.NaHC}}{{\text{O}}_{\text{3}}}{\text{.}}\)
Explanation:
Phenol is a weak acid. It reacts with \(\mathrm{NaOH}\) to produce salt. But it is not sufficiently acidic to evolve \(\mathrm{CO}_{2}\) from \(\mathrm{NaHCO}_{3}\) solution.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323258
The increasing order of \(\mathrm{pK}_{\mathrm{a}}\) for the following phenols is (A) 2, 4 – Dinitrophenol (B) 4 – Nitrophenol (C) 2, 4, 5 – Trimethylphenol (D) Phenol (E) 3 – Chlorophenol Choose the correct answer from the options given below:
1 (A), (E), (B), (D), (C)
2 (C), (E), (D), (B), (A)
3 (C), (D), (E), (B), (A)
4 (A), (B), (E), (D), (C)
Explanation:
Higher the stability of resulting phenoxide ion, lower will be the \(\mathrm{pK}_{\mathrm{a}}\). Electron withdrawing groups stabilise the phenoxide ion and electron releasing groups destablise the phenoxide ion. Nitro and chloro groups increase acidic nature and decrease pKa value. Methyl group decreases acidic nature and increases pKa value.Hence, the correct order of increasing pKa values is, (A) \( < \) (B) \( < \) (E) \( < \) (D) \( < \) (C).
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323259
Match the following acids with their \(\mathrm{pK}_{\mathrm{a}}\) values: Column I Column II A Phenol P 16 B p-Nitrophenol Q 0.78 C Ethanol R 10 D Picric acid S 7.1
1 \({\text{A - R, B - S,}}\,\,\,{\text{C - P, D - Q}}\)
2 \({\text{A - Q, B - P,}}\,\,\,{\text{C - R, D - S}}\)
3 \({\text{A - R, B - P,}}\,\,\,{\text{C - S, D - Q}}\)
4 \({\text{A - S, B - Q,}}\,\,\,{\text{C - R, D - P}}\)
323256
Which one of the following properties is exhibited by phenol?
1 It is soluble in aq. \(\mathrm{NaOH}\) and evolves \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
2 It is soluble in aq. \(\mathrm{NaOH}\) and does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
3 It is not soluble in aq. \(\mathrm{NaOH}\) but evolves \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
4 It is insoluble in aq. \(\mathrm{NaOH}\) and does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
Explanation:
Phenol is soluble in aq. \(\mathrm{NaOH}\) forming sodium phenoxide. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}+\mathrm{NaOH} \rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{ONa}+\mathrm{H}_{2} \mathrm{O}\) But phenol does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\) and aq. \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) because phenol is weaker acid than carbonic acid.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323257
Which one of the following properties is exhibited by phenol?
1 It is soluble in \({\rm{aq}}\,\,{\rm{NaOH}}\) and evolves \({\rm{C}}{{\rm{O}}_{\rm{2}}}\,{\rm{with}}\,{\rm{aq}}\,{\rm{NaHC}}{{\rm{O}}_{\rm{3}}}\)
2 It is soluble in \({\rm{aq}}{\rm{.NaOH}}\) and does not evolve \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{with}}\,{\rm{aq}}\,{\rm{.NaHC}}{{\rm{O}}_{\rm{3}}}\)
3 It is not soluble in \({\rm{aq\,NaOH}}\) but evolves \({\rm{C}}{{\rm{O}}_{\rm{2}}}\,{\rm{with}}{\mkern 1mu} \,{\rm{aq}}{\mkern 1mu} \,{\rm{NaHC}}{{\rm{O}}_{\rm{3}}}\)
4 It is insoluble in \({\text{aq}}\,\,{\text{NaOH}}\,\,{\text{but}}\,{\text{does}}\,{\text{not}}\,{\text{evolve C}}{{\text{O}}_{\text{2}}}\,{\text{with}}{\mkern 1mu} \,{\text{aq}}{\text{.NaHC}}{{\text{O}}_{\text{3}}}{\text{.}}\)
Explanation:
Phenol is a weak acid. It reacts with \(\mathrm{NaOH}\) to produce salt. But it is not sufficiently acidic to evolve \(\mathrm{CO}_{2}\) from \(\mathrm{NaHCO}_{3}\) solution.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323258
The increasing order of \(\mathrm{pK}_{\mathrm{a}}\) for the following phenols is (A) 2, 4 – Dinitrophenol (B) 4 – Nitrophenol (C) 2, 4, 5 – Trimethylphenol (D) Phenol (E) 3 – Chlorophenol Choose the correct answer from the options given below:
1 (A), (E), (B), (D), (C)
2 (C), (E), (D), (B), (A)
3 (C), (D), (E), (B), (A)
4 (A), (B), (E), (D), (C)
Explanation:
Higher the stability of resulting phenoxide ion, lower will be the \(\mathrm{pK}_{\mathrm{a}}\). Electron withdrawing groups stabilise the phenoxide ion and electron releasing groups destablise the phenoxide ion. Nitro and chloro groups increase acidic nature and decrease pKa value. Methyl group decreases acidic nature and increases pKa value.Hence, the correct order of increasing pKa values is, (A) \( < \) (B) \( < \) (E) \( < \) (D) \( < \) (C).
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323259
Match the following acids with their \(\mathrm{pK}_{\mathrm{a}}\) values: Column I Column II A Phenol P 16 B p-Nitrophenol Q 0.78 C Ethanol R 10 D Picric acid S 7.1
1 \({\text{A - R, B - S,}}\,\,\,{\text{C - P, D - Q}}\)
2 \({\text{A - Q, B - P,}}\,\,\,{\text{C - R, D - S}}\)
3 \({\text{A - R, B - P,}}\,\,\,{\text{C - S, D - Q}}\)
4 \({\text{A - S, B - Q,}}\,\,\,{\text{C - R, D - P}}\)
323256
Which one of the following properties is exhibited by phenol?
1 It is soluble in aq. \(\mathrm{NaOH}\) and evolves \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
2 It is soluble in aq. \(\mathrm{NaOH}\) and does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
3 It is not soluble in aq. \(\mathrm{NaOH}\) but evolves \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
4 It is insoluble in aq. \(\mathrm{NaOH}\) and does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
Explanation:
Phenol is soluble in aq. \(\mathrm{NaOH}\) forming sodium phenoxide. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}+\mathrm{NaOH} \rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{ONa}+\mathrm{H}_{2} \mathrm{O}\) But phenol does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\) and aq. \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) because phenol is weaker acid than carbonic acid.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323257
Which one of the following properties is exhibited by phenol?
1 It is soluble in \({\rm{aq}}\,\,{\rm{NaOH}}\) and evolves \({\rm{C}}{{\rm{O}}_{\rm{2}}}\,{\rm{with}}\,{\rm{aq}}\,{\rm{NaHC}}{{\rm{O}}_{\rm{3}}}\)
2 It is soluble in \({\rm{aq}}{\rm{.NaOH}}\) and does not evolve \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{with}}\,{\rm{aq}}\,{\rm{.NaHC}}{{\rm{O}}_{\rm{3}}}\)
3 It is not soluble in \({\rm{aq\,NaOH}}\) but evolves \({\rm{C}}{{\rm{O}}_{\rm{2}}}\,{\rm{with}}{\mkern 1mu} \,{\rm{aq}}{\mkern 1mu} \,{\rm{NaHC}}{{\rm{O}}_{\rm{3}}}\)
4 It is insoluble in \({\text{aq}}\,\,{\text{NaOH}}\,\,{\text{but}}\,{\text{does}}\,{\text{not}}\,{\text{evolve C}}{{\text{O}}_{\text{2}}}\,{\text{with}}{\mkern 1mu} \,{\text{aq}}{\text{.NaHC}}{{\text{O}}_{\text{3}}}{\text{.}}\)
Explanation:
Phenol is a weak acid. It reacts with \(\mathrm{NaOH}\) to produce salt. But it is not sufficiently acidic to evolve \(\mathrm{CO}_{2}\) from \(\mathrm{NaHCO}_{3}\) solution.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323258
The increasing order of \(\mathrm{pK}_{\mathrm{a}}\) for the following phenols is (A) 2, 4 – Dinitrophenol (B) 4 – Nitrophenol (C) 2, 4, 5 – Trimethylphenol (D) Phenol (E) 3 – Chlorophenol Choose the correct answer from the options given below:
1 (A), (E), (B), (D), (C)
2 (C), (E), (D), (B), (A)
3 (C), (D), (E), (B), (A)
4 (A), (B), (E), (D), (C)
Explanation:
Higher the stability of resulting phenoxide ion, lower will be the \(\mathrm{pK}_{\mathrm{a}}\). Electron withdrawing groups stabilise the phenoxide ion and electron releasing groups destablise the phenoxide ion. Nitro and chloro groups increase acidic nature and decrease pKa value. Methyl group decreases acidic nature and increases pKa value.Hence, the correct order of increasing pKa values is, (A) \( < \) (B) \( < \) (E) \( < \) (D) \( < \) (C).
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323259
Match the following acids with their \(\mathrm{pK}_{\mathrm{a}}\) values: Column I Column II A Phenol P 16 B p-Nitrophenol Q 0.78 C Ethanol R 10 D Picric acid S 7.1
1 \({\text{A - R, B - S,}}\,\,\,{\text{C - P, D - Q}}\)
2 \({\text{A - Q, B - P,}}\,\,\,{\text{C - R, D - S}}\)
3 \({\text{A - R, B - P,}}\,\,\,{\text{C - S, D - Q}}\)
4 \({\text{A - S, B - Q,}}\,\,\,{\text{C - R, D - P}}\)
323256
Which one of the following properties is exhibited by phenol?
1 It is soluble in aq. \(\mathrm{NaOH}\) and evolves \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
2 It is soluble in aq. \(\mathrm{NaOH}\) and does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
3 It is not soluble in aq. \(\mathrm{NaOH}\) but evolves \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
4 It is insoluble in aq. \(\mathrm{NaOH}\) and does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\).
Explanation:
Phenol is soluble in aq. \(\mathrm{NaOH}\) forming sodium phenoxide. \(\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}+\mathrm{NaOH} \rightarrow \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{ONa}+\mathrm{H}_{2} \mathrm{O}\) But phenol does not evolve \(\mathrm{CO}_{2}\) with aq. \(\mathrm{NaHCO}_{3}\) and aq. \(\mathrm{Na}_{2} \mathrm{CO}_{3}\) because phenol is weaker acid than carbonic acid.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323257
Which one of the following properties is exhibited by phenol?
1 It is soluble in \({\rm{aq}}\,\,{\rm{NaOH}}\) and evolves \({\rm{C}}{{\rm{O}}_{\rm{2}}}\,{\rm{with}}\,{\rm{aq}}\,{\rm{NaHC}}{{\rm{O}}_{\rm{3}}}\)
2 It is soluble in \({\rm{aq}}{\rm{.NaOH}}\) and does not evolve \({\rm{C}}{{\rm{O}}_{\rm{2}}}{\rm{with}}\,{\rm{aq}}\,{\rm{.NaHC}}{{\rm{O}}_{\rm{3}}}\)
3 It is not soluble in \({\rm{aq\,NaOH}}\) but evolves \({\rm{C}}{{\rm{O}}_{\rm{2}}}\,{\rm{with}}{\mkern 1mu} \,{\rm{aq}}{\mkern 1mu} \,{\rm{NaHC}}{{\rm{O}}_{\rm{3}}}\)
4 It is insoluble in \({\text{aq}}\,\,{\text{NaOH}}\,\,{\text{but}}\,{\text{does}}\,{\text{not}}\,{\text{evolve C}}{{\text{O}}_{\text{2}}}\,{\text{with}}{\mkern 1mu} \,{\text{aq}}{\text{.NaHC}}{{\text{O}}_{\text{3}}}{\text{.}}\)
Explanation:
Phenol is a weak acid. It reacts with \(\mathrm{NaOH}\) to produce salt. But it is not sufficiently acidic to evolve \(\mathrm{CO}_{2}\) from \(\mathrm{NaHCO}_{3}\) solution.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323258
The increasing order of \(\mathrm{pK}_{\mathrm{a}}\) for the following phenols is (A) 2, 4 – Dinitrophenol (B) 4 – Nitrophenol (C) 2, 4, 5 – Trimethylphenol (D) Phenol (E) 3 – Chlorophenol Choose the correct answer from the options given below:
1 (A), (E), (B), (D), (C)
2 (C), (E), (D), (B), (A)
3 (C), (D), (E), (B), (A)
4 (A), (B), (E), (D), (C)
Explanation:
Higher the stability of resulting phenoxide ion, lower will be the \(\mathrm{pK}_{\mathrm{a}}\). Electron withdrawing groups stabilise the phenoxide ion and electron releasing groups destablise the phenoxide ion. Nitro and chloro groups increase acidic nature and decrease pKa value. Methyl group decreases acidic nature and increases pKa value.Hence, the correct order of increasing pKa values is, (A) \( < \) (B) \( < \) (E) \( < \) (D) \( < \) (C).
JEE - 2023
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323259
Match the following acids with their \(\mathrm{pK}_{\mathrm{a}}\) values: Column I Column II A Phenol P 16 B p-Nitrophenol Q 0.78 C Ethanol R 10 D Picric acid S 7.1
1 \({\text{A - R, B - S,}}\,\,\,{\text{C - P, D - Q}}\)
2 \({\text{A - Q, B - P,}}\,\,\,{\text{C - R, D - S}}\)
3 \({\text{A - R, B - P,}}\,\,\,{\text{C - S, D - Q}}\)
4 \({\text{A - S, B - Q,}}\,\,\,{\text{C - R, D - P}}\)
