Which one of the following pairs gives effervescence with aq. NaHCO 3 ? underset(I)CH 3 COCl underset(II)CH 3 COCH 3 underset(III)CH 3 COOCH 3 underset(IV)CH 3 COOCOCH 3

Question

Which one of the following pairs gives effervescence with aq. NaHCO 3 ? underset(I)CH 3 COCl underset(II)CH 3 COCH 3 underset(III)CH 3 COOCH 3 underset(IV)CH 3 COOCOCH 3 (A) I and II (B) I and IV (C) II and III (D) I and III

Tardigrade Admin · Accepted Answer

Due to strong negative inductive effect shown by

- Cl

and

- OCOC H_{3}

group, acid chloride and acid anhydride are highly reactive among acid derivatives. They react independently with water even in the absence of catalyst to give carboxylic acid.

C H_{3} - C ∣∣ O - Cl N a H C O_{3} (a q) C H_{3} - C ∣∣ O - ON a + C O_{2} + H Cl

C H_{3} C ∣∣ O - O - C ∣∣ O C H_{3} N a H C O_{3} (a q) 2 C H_{3} - C ∣∣ O - ON a + C O_{2}

Q. Which one of the following pairs gives effervescence with aq. NaHCO3​? (I)CH3​COCl​ (II)CH3​COCH3​​ (III)CH3​COOCH3​​ (IV)CH3​COOCOCH3​​

I and II

I and IV

II and III

I and III

Q. Which one of the following pairs gives effervescence with aq. $N a H C O_{3} ?$
$(I) C H_{3} COCl$
$(II) C H_{3} COC H_{3}$
$(III) C H_{3} COOC H_{3}$
$(I V) C H_{3} COOCOC H_{3}$