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Topic Question Set

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]

[IMAGE 257]

  • [IMAGE 258]

     

  • [IMAGE 259]

     

  • [IMAGE 260]

     

  • [IMAGE 261]

     

(2)

[IMAGE 262]

 

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]

[IMAGE 263]

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]

[IMAGE 264]

  • [IMAGE 265]

     

  • [IMAGE 266]

     

  • [IMAGE 267]

     

  • [IMAGE 268]

     

(3)

[IMAGE 269]

 

Q 6 :    

The correct order of strengths of the carboxylic acids

[IMAGE 270]

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.