Q 11 :

In the Claisen-Schmidt reaction to prepare dibenzalacetone from 5.3 g of benzaldehyde, a total of 3.51 g of product was obtained. The percentage yield in this reaction was _____%.                        [2025]

Q 12 :

Identify the structure of the final product (D) in the following sequence of the reactions:

Total number of $s{p}^2$ hybridised carbon atoms in product D is _____.                [2025]

Q 13 :

Match List I with List II                          [2023]

	List I		List II
	Reaction		Reagents
A.	Hoffmann Degradation	I.	Conc. KOH, $\mathrm{\Delta }$
B.	Clemmensen reduction	II.	${\mathrm{CHCl}}_3,\mathrm{NaOH}/{\mathrm{H}}_3{\mathrm{O}}^{\oplus }$
C.	Cannizzaro reaction	III.	${\mathrm{Br}}_2$, NaOH
D.	Reimer–Tiemann Reaction	IV.	Zn–Hg / HCl

Choose the correct answer from the options given below:

• (A) – III, (B) – IV, (C) – II, (D) – I

   

• (A) – III, (B) – IV, (C) – I, (D) – II

   

• (A) – II, (B) – IV, (C) – I, (D) – III

   

• (A) – II, (B) – I, (C) – III, (D) – IV

   

Q 14 :

Match List I with List II                      [2023]

	List I		List II
	Name of reaction		Reagent used
A.	Hell–Volhard–Zelinsky reaction	I.	$\text{NaOH}+{\text{I}}_2$
B.	Iodoform reaction	II.	${\text{(i) CrO}}_2{\text{Cl}}_2,{\text{CS}}_2$ ${\text{(ii) H}}_2\text{O}$
C.	Etard reaction	III.	${\text{(i) Br}}_2/\text{red phosphorus}$  ${\text{(ii) H}}_2\text{O}$
D.	Gattermann–Koch reaction	IV.	$\text{CO},\text{HCl},{\text{anhyd. AlCl}}_3$

Choose the correct answer from the options given below:

• A–III, B–I, C–II, D–IV

   

• A–I, B–II, C–III, D–IV

   

• A–III, B–I, C–IV, D–II

   

• A–III, B–II, C–I, D–IV

   

Q 15 :

The correct sequence of reagents for the above conversion of X to Y is:            [2026]

• (i) Jones reagent (ii) NaOEt (iii) Hot ${\mathrm{KMnO}}_4$ / KOH

   

• (i) ${\mathrm{B}}_2{\mathrm{H}}_6/{\mathrm{H}}_2{\mathrm{O}}_2$ (ii) NaOEt (iii) Jones reagent

   

• (i) NaOH (aq) (ii) Jones reagent (iii) ${\mathrm{H}}_3{\mathrm{O}}^{+}$

   

• (i) NaOEt (ii) ${\mathrm{B}}_2{\mathrm{H}}_6/{\mathrm{H}}_2{\mathrm{O}}_2$ (iii) Jones reagent

   

Q 16 :

A hydroxy compound (X) with molar mass 122 g ${\mathrm{mol}}^{-1}$ is acetylated with acetic anhydride, using a large excess of the reagent ensuring complete acetylation of all hydroxyl groups. The product obtained has a molar mass of 290 g ${\mathrm{mol}}^{-1}$. The number of hydroxyl groups present in compound (X) is:           [2026]

• 5

   

• 2

   

• 3

   

• 4

   

Q 17 :

A student is given one compound among the following compounds that gives positive test with Tollen’s reagent.

The compound is:                   [2026]

• D

   

• B

   

• C

   

• A

   

Q 18 :

Consider the following two reactions A and B.

Numerical value of [molar mass of $x+$ molar mass of $y$] is ______.           [2026]

• 88

   

• 160

   

• 4

   

• 46

   

Q 19 :

Match the LIST-I with LIST-II                        [2026]

	List-I		List-II
	Reagents		Name of reaction involving carbonyl compounds
A.	${\mathrm{NH}}_2–{\mathrm{NH}}_2,\mathrm{KOH}$	I.	Tollen’s Test
B.	$\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\mathrm{OH}$	II.	Clemmensen Reduction
C.	Aqueous ${\mathrm{CuSO}}_4$, Sodium potassium tartrate, KOH	III.	Wolff–Kishner Reduction
D.	$\mathrm{Zn}–\mathrm{Hg},\mathrm{HCl}$	IV.	Fehling’s Test

 

Choose the correct answer from the options given below:

• A–III, B–IV, C–I, D–II

   

• A–IV, B–III, C–II, D–I

   

• A–III, B–I, C–IV, D–II

   

• A–II, B–I, C–IV, D–III

   

Q 20 :

Which of the following statements are TRUE about Haloform reaction?

A. Sodium hypochlorite reacts with KI to give KOI.
B. KOI is a reducing agent.
C. $\alpha ,\beta -$unsaturated methylketone  will give iodoform reaction.
D. Isopropyl alcohol will not give iodoform test.
E. Methanoic acid will give positive iodoform test.

Choose the correct answer from the options given below:    [2026]

• A, B & C Only

   

• A, C & E Only

   

• A & C Only

   

• B, D & E Only