• 072920 77839
  • info@smartachievers.in
Menu
Back
  • JEE ADVANCE
  • JEE MAIN
  • NEET
  • BITSAT
  • CBSE BOARD
  • UP BOARD
JEE ADVANCE
  • CLASS XI - XII
JEE MAIN
  • CLASS XI - XII
NEET
  • CLASS XI - XII
BITSAT
  • CLASS XI - XII
CBSE BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII
  • CLASS VI
  • CLASS VII
  • CLASS VIII
UP BOARD
  • CLASS IX
  • CLASS X
  • CLASS XI
  • CLASS XII

Topic Question Set

Q 1 :

Which among the following aldehydes is most reactive towards nucleophilic addition reactions?                  [2024]

  •  

  •  

  •  

  •  

(2)

Reactivity of aldehydes and ketones is more in nucleophilic addition reactions if:

(i) Partial positive charge on carbonyl carbon is more, Nu- is attracted more and hence more is reactivity.

(ii) Lesser is crowding around carbonyl carbon, easier is it for Nu- to approach, hence more is reactivity.

Presence of alkyl groups around carbonyl carbon decreases partial positive charge of the carbonyl carbon due to +I effect of alkyl groups. Also, bulky alkyl groups hinder attack of Nu- on carbonyl carbon. Hence presence of alkyl groups around carbonyl carbon decreases reactivity of aldehydes/ketones towards nucleophilic addition.

 

Q 2 :

The compound formed by the reaction of ethanal with semicarbazide contains ______ number of nitrogen atoms.           [2024]



(3)

 

Q 3 :

Residue (A) + HCl (dil) → Compound (B)

Structure of residue (A) and compound (B) formed respectively is:     [2025]

  •  

  •  

  •  

  •  

(4)

 

Q 4 :

Given below are two statements:                [2025]

Consider the following reaction

In the light of the above statements, choose the correct answer from the options given below:

  • Both Statement I and Statement II are false

     

  • Both Statement I and Statement II are true

     

  • Statement I is true but Statement II is false

     

  • Statement I is false but Statement II is true

     

(2)

Lesser is steric hindrance around C=O and more is partial positive charge on the carbon of C=O, easier is the attack by nucleophile.

 

Q 5 :

Which of the following arrangements with respect to their reactivity in nucleophilic addition reaction is correct?    [2025]

  • p-nitrobenzaldehyde < benzaldehyde < p-tolualdehyde < acetophenone

     

  • acetophenone < p-tolualdehyde < benzaldehyde < p-nitrobenzaldehyde

     

  • benzaldehyde < acetophenone < p-nitrobenzaldehyde < p-tolualdehyde

     

  • acetophenone < benzaldehyde < p-tolualdehyde < p-nitrobenzaldehyde

     

(2)

Lesser is crowding around C=O and more is partial positive charge on carbon of C=O, more is reactivity of carbonyl compounds towards nucleophilic addition. Electron withdrawing groups increase partial positive charge and electron releasing groups decrease partial positive charge on C=O.

 

Q 6 :

Find out the major products from the following reaction sequence.                  [2023]

  •  

  •  

  •  

  •  

(3)

Q 7 :

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R:

Assertion A: Acetal/Ketal is stable in basic medium

Reason R: The high leaving tendency of alkoxide ion gives the stability to acetal/ketal in basic medium.

In the light of the above statements, choose the correct answer from the options given below:              [2023]

  • Both A and R are true but R is NOT the correct explanation of A

     

  • A is false but R is true

     

  • A is true but R is false

     

  • Both A and R are true and R is the correct explanation of A

     

(3)

Acetals or ketals are stable in basic medium as alkoxide ion has poor leaving tendency.

 

Q 8 :

'A' in the given reaction is                                [2023]

  •  

  •  

  •  

  •  

(4)

Q 9 :

Find out the major product from the following reaction.              [2023]

  •  

  •  

  •  

  •  

(1)

In the presence of Cu-catalyst substituted enone undergoes conjugate addition with G.R.

Q 10 :

The structures of major products A, B and C in the following reaction are sequence.                  [2023]

  •  

  •  

  •  

  •  

(3)