Q 1 :

The correct order of decreasing acidity of the following aliphatic acids is             [2025]
 

  • HCOOH>CH3COOH>(CH3)2CHCOOH>(CH3)3CCOOH

     

  • HCOOH>(CH3)3CCOOH>(CH3)2CHCOOH>CH3COOH

     

  • (CH3)3CCOOH>(CH3)2CHCOOH>CH3COOH>HCOOH

     

  • CH3COOH>(CH3)2CHCOOH>(CH3)3CCOOH>HCOOH

     

(1)

Acidic strength ∝-I effect ∝1+I effect. Electron donating groups decrease the stability of carboxylate ion. Thus, the correct order of decreasing acidity is 
HCOOH>CH3COOH>(CH3)2CHCOOH>(CH3)3CCOOH.



Q 2 :

Identify the product in the following reaction.                     [2023]

  •  

  •  

  •  

  •  

(2)

 



Q 3 :

Weight (g) of two moles of the organic compound, which is obtained by heating sodium ethanoate with sodium hydroxide in presence of calcium oxide is       [2023]

  • 30

     

  • 18

     

  • 16

     

  • 32

     

(4)

CH3COONaSodium ethanoate→ΔNaOH/CaOCH4Methane+Na2CO3Sodium carbonate

Weight of two moles of methane is 32 g.

 



Q 4 :

Match List-I with List-II.                                         [2021]

Choose the correct answer from the options given below.

  • (A) – (ii), (B) – (iii), (C) – (iv), (D) – (i)

     

  • (A) – (iv), (B) – (i), (C) – (ii), (D) – (iii)

     

  • (A) – (iii), (B) – (ii), (C) – (i), (D) – (iv)

     

  • (A) – (i), (B) – (iv), (C) – (iii), (D) – (ii)

     

(1)

 



Q 5 :

The major product of the following reaction is           [2019]

  •  

  •  

  •  

  •  

(3)

 



Q 6 :

The correct order of strengths of the carboxylic acids

is                                                                     [2016]

  • I > II > III

     

  • II > III > I

     

  • III > II > I

     

  • II > I > III

     

(2)

Acidic strength ∝ –I effect

As oxygen is more electron withdrawing, (II) and (III) show greater –I effect than (I). Thus, (I) is least acidic. Out of (II) and (III), (II) is more acidic than (III) as distance of O increases from –COOH group and the acidic strength decreases.