Identify the correct trend of acidic strength for the given alcohols:
1
(i)>(iii)>(ii)
2
(ii)>(i)>(iii)
3
(ii)>(iii)>(i)
4
(iii)>(ii)>(i)
Official Solution
Correct Option:
(2)
Acidic strength in alcohols depends on the stability of the conjugate base (alkoxide ion). The more stable the alkoxide, the stronger the acid. - (ii) is ethanol (primary) – least hindered, most acidic.
- (i) is isopropyl alcohol (secondary) – more hindered, less acidic.
- (iii) is tert-butyl alcohol (tertiary) – most hindered, least acidic. Thus, the correct order is:
02
PYQ 2022
medium
chemistryID: ap-eapce
An aryl carboxylic acid on treatment with sodium hydrogen carbonate liberates a gaseous molecule. Identify the gas molecule liberated.
1
H2
2
CO2
3
CO
4
O2
Official Solution
Correct Option:
(2)
Carboxylic acids react with NaHCO3} to liberate carbon dioxide gas:
Ar–COOH + NaHCO3} → Ar–COONa + H2}O + CO2}↑
Effervescence of CO2} is a test for carboxylic acids.
03
PYQ 2022
medium
chemistryID: ap-eapce
Arrange the following in increasing order of their reactivity for nucleophilic addition reaction:
1
2
3
4
Official Solution
Correct Option:
(1)
The reactivity of carbonyl compounds towards nucleophilic addition depends on the electron withdrawing or donating nature of the substituents.
% Option
(a) Benzophenone has two electron-donating phenyl groups — least reactive.
% Option
(b) p-Methylbenzaldehyde — methyl is slightly donating.
% Option
(c) Benzaldehyde — no additional substituent.
% Option
(d) p-Nitrobenzaldehyde — nitro group is strongly withdrawing, making the carbon more electrophilic.
Thus, reactivity order:
About Aldehydes And Ketones - AP-EAPCET
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