ISC Class 12 Chemistry Competency Focused Questions 2026, Download PDF for Board Exam Preparation

Particulars

Details

Conducting Board

Council for the Indian School Certificate Examinations (CISCE)

Exam Level

ISC Class 12

Subject

Chemistry

Paper

Paper 1 (Theory)

Exam Date 2026

Monday, February 23, 2026

Availability

PDF download

Official Website

cisce.org 

Question Numbers

Question

1

Which of the following reactions will NOT form an ether through Williamsons

synthesis?

I: C2H5ONa + CH3Br →

II: C6H5Cl + C2H5ONa→

III: C6H5ONa + CH3I →

IV: C2H5ONa + (CH3)3C—Br →

(a) I and III

(b) II and III

(c) III and IV

(d) II and IV

2

The correct order of acidic strength among the following organic compound is:

(a) Z > X > Y

(b) Y > X > Z

(c) Z> Y > X

(d) X > Z > Y

3

For the reaction:

What are X and R respectively in the given reaction?

(a) X: Acetaldehyde R: methyl

(b) X: Formaldehyde R: methyl

(c) X: Acetaldehyde R: ethyl

(d) X: Formaldehyde R: ethyl

4

An element [X] has an outer electronic configuration as 3d5 4s2. The maximum oxidation state and most common oxidising state of the element will be:

(a) +5, +3

(b) +2, +2

(c) +7, +3

(d) +7, +2

5

Secondary amines can be prepared by reduction. Identify the compound that will form a secondary amine on reaction with LiAlH4?

(a) Methyl cyanide

(b) Methyl isocyanide

(c) Acetamide

(d) Nitroethane

6

Which of the following is most basic?

(a) Aniline

(b) Ethylamine

(c) Ammonia

(d) Benzylamine

7

Depression in freezing point is a colligative property. At the same concentration in aqueous solution, select the solution that will show the largest freezing point depression.

(a) Na3PO4

(b) C12H22O11

(c) NaCl

(d) K2SO4

8

When the molality of the dilute solution is multiplied by four, what will be the resulting effect on the molal depression constant (Kf)?

(a) Four times

(b) Unchanged

(c) Halved

(d) Eight times

9

If Sodium nitrate is completely dissociated into cations and anions in aqueous solution, the change in freezing point of water (∆Tf), when 0.05 mol of sodium nitrate is dissolved in 1 kg of water is: (Kf = 1.86 K kg mol-1)

(a) 0.1860

(b) 1.860

(c) 0.0186

(d) 0.279

10

For a reaction A → B + C, when a student X doubled the concentration of ‘A’, the rate of reaction was found to increase by eight times. The unit of rate constant (k) will be:

(a) s-1

(b) mol-1Ls-1

(c) mol2L2 s-1

(d) mol L-1s-1

11

Which of the following combinations is INCORRECT regarding order and

molecularity of a hypothetical reaction?

(a) order = 2, molecularity = 1

(b) order = 3/2, molecularity 2

(c) order =1 molecularity =2

(d) order = 1⁄2 molecularity = 3/2

12

With which of the following reagent both glucose and fructose will produce the same product?

(a) Bromine water

(b) Hydroxyl amine

(c) Phenyl hydrazine

(d) Conc. HNO3

13

What kind of bond will be formed when glycine and alanine are condensed together?

(a) Zwitter ionic bond

(b) Glycosidic bond

(c) Peptide bond

(d) Coordinate bond

14

The reaction of the compound A with NH3 give an aromatic amine B. This amine on treatment with nitrous acid forms a diazonium salt which is used in the preparation of A. Identify A and B.

(a) C6H5NH2 and C6H5Cl.

(b) C6H5Cl and C6H5OH.

(c) C6H5CN and C6H5Cl.

(d) C6H5Cl and C6H5NH2

15

Rahul wants to prepare chloroform in the laboratory using ethanol. The correct order of preparation is:

(a) oxidation, liberation of Cl2, hydrolysis and chlorination.

(b) liberation of Cl2, oxidation, chlorination, hydrolysis.

(c) hydrolysis, oxidation, chlorination, liberation of chlorine.

(d) chlorination, hydrolysis, oxidation, liberation of chlorine.

ISC Class 12 Chemistry Competency Focused Questions 2026

Monday, February 23

Chemistry, Paper 1 (Theory)