Class 12th Chemistry Periodic Test 1 Question Paper 2026 – 27: St. Margaret, Rohini, Delhi

School Name:	St. Margaret Sr. Sec. School, D-Block, Prashant Vihar, Sector 14, Rohini, Delhi
Class:	XII
Subject:	Chemistry
Exam:	Periodic Test I (2026–27) – Set B
Time:	1 Hour
Maximum Marks:	30

General Instructions:

Read the following instructions carefully

1. There are 19 questions in this question paper.
2. Q No-1 to 10 are MCQ carrying 1 mark each.
3. Q No-11 to 17 are short answer questions carrying 2 marks each.
4. Q No-18 to 19 are long answer questions carrying 3 marks each.
5. All questions are compulsory.

Question 01: The IUPAC name of (CH3)3C-OH is: (1)

1. 1-Methyl-1-propanol
2. 2-Methyl-1-propanol
3. 2-Methyl-2-propanol
4. Isobutyl alcohol

Question 02: CH₃CH₂OH can be converted into CH₃CHO by ____________________. (1)

1. catalytic hydrogenation
2. treatment with LiAlH₄
3. treatment with pyridinium chlorochromate
4. treatment with KMnO₄

Question 03: Phenol reacts with CO₂ at 3-7 atm, on heating in presence of NaOH followed by acidification to form (1)

1. Salicylic acid
2. Aspirin
3. Benzoic acid
4. Methyl benzoate

Question 04: Which of the following is hydrolysed most easily? (1)

1. CH₃I
2. CH₃Br
3. CH₃Cl
4. CH₃F

Question 05: Which is the correct increasing order of boiling points of the following compounds?

1-Bromoethane, 1-Bromopropane, 1-Bromobutane, Bromobenzene (1)

1. Bromobenzene < 1-Bromobutane < 1-Bromopropane < 1-Bromoethane
2. Bromobenzene < 1-Bromoethane < 1-Bromopropane < 1-Bromobutane
3. 1-Bromopropane < 1-Bromobutane < 1-Bromoethane < Bromobenzene
4. 1-Bromoethane < 1-Bromopropane < 1-Bromobutane < Bromobenzene

Question 06: Which of the following is a vinylic halide? (1)

1. CH₂=CH-CH₂Cl
2. CH₃CH=CH-Cl
3. C₆H₅Cl
4. CH₃CH₂Cl

Question 07: Among the following sets of reactants which one produces ethanol? (1)

1. HCHO; CH₃MgX, H₂O
2. C₆H₅OH; NaOH, CH₃I
3. C₆H₅OH, neutral FeCl₃
4. C₆H₅-CH₃; CH₃COCl; AlCl₃

Question 08: Arrange the following in increasing order of acidic character: (1)

1. IV < III < I < II
2. II < IV < I < III
3. I < II < III < IV
4. III < I < II < IV

Question 09: In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choices.

1. Assertion and reason both are correct and reason is correct explanation of assertion.
2. Assertion and reason both are correct statements but reason is not correct explanation of assertion.
3. Assertion is correct but reason is wrong statement.
4. Assertion is wrong but reason is correct statement.

Assertion: KCN reacts with methyl chloride to give methyl isocyanide.

Reason: CN^– is an ambident nucleophile. (1)

Question 10: Assertion: Phenol undergo nucleophilic substitution easily. (1)

Reason: The -OH group in phenol is stabilized by resonance.

Question 11: Give mechanism of the following reaction: (2)

CH₂=CH₂ + H₂O
H⁺ →
CH₃CH₂OH

Question 12: (2)

(a) Which alkyl halide from the following pairs would you expect to be CHIRAL and why?

(b) Out of S_N1 and S_N2, which reaction occurs with racemisation? Give reason.

Question 13: (2)

1. Phenol is more acidic than ethanol. Give reason for your answer.
2. Why C-O-H bond angle in alcohol is slightly smaller than tetrahedral angle?

Question 14: Write chemical equation when (2)

1. methyl chloride is treated with AgNO₂.
2. bromobenzene is treated with CH₃Cl in the presence of anhydrous AlCl₃.

Question 15: Write the structural formulae of the organic compounds ‘A’, ‘B’, ‘C’ and ‘D’ in the following sequence of reactions: (2)