Question

Read the following passage and answer the following questions:

Both alcohols and phenols contain a hydroxyl group, but phenols are more acidic than alcohols.

The reason being that the phenoxide ion left after the removal of a proton is stabilized by

resonance while the alkoxide ion is not therefore phenols dissolve in aqueous sodium hydroxide but

alcohols do not. However, both are weaker acids than carbonic acid and hence do not decompose

aqueous NaHCO3 solution evolving CO2. The presence of electron – donating groups in the benzene

ring decrease the acid strength while the presence of electron- withdrawing groups in the benzene

ring increase the acid strength of phenols. The relative strength of o-, m- and p- substituted

phenols, however , depends upon a combination of inductive and resonance effects of the

substituent.

Alcohols are very weak acids even weaker than water. Because of the +I-effect of the alkyl

groups, the acidic strength of alcohols decreases in the order : 10 alcohol > 20 alcohol >30 alcohol.

i) The correct order of reactivity of 10

, 20 3

0 alcohols towards sodium metal is

a) 10 > 20 > 30

b)10 > 30 > 2

0

c) 30 > 20 > 10

d)20 > 10 > 30

ii) Which of the following is the strongest acid

a) FCH2CH2CH2CH2 OH b) FCH2CH2CH2OH

c) CH3 CH2CF2CH2OH d)CH3CHFCH2CH2OH

iii) The acidic strength decreases in the order

a)p- Nitrophenol > m-nitrophenol > o- nitrophenol

b)p-Nitrophenol > o-nitrophenol > m-nitrophenol

c) m-nitrophenol > o- nitrophenol > p- nitrophenol

d)o-nitrophenol > m-nitrophenol > p- nitrophenol

OR

Which of the following is the strongest acid

a) o- Fluorophenol b) o-Chlorophenol

c )o- bromophenol c) o-iodophenol

iv)The strongest acid among the following is

a)0-Methoxyphenol b)p-Methoxyphenol

c)m- Methoxyphenol c) Phenol​

Answer 1

Answer:

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Answer 2

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