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CBSE Class 12 Pre Board 2021 : Chemistry - Set 3 (CBSE Gulf Sahodaya Qatar Chapter, Doha)

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MODEL EXAMINATION (2020-21) CHEMISTRY (CODE-043) STD XII Marks: 70 Time: 3 Hrs General Instructions. Read the following instructions carefully. a) There are 33 questions in this question paper. All questions are compulsory. b) Section A: Q. No. 1 to 2 are case-based questions having four MCQs or Reason Assertion type based on given passage each carrying 1 mark. c) Section A: Question 3 to 16 are MCQs and Reason Assertion type questions carrying 1 mark each d) Section B: Q. No. 17 to 25 are short answer questions and carry 2 marks each. e) Section C: Q. No. 26 to 30 are short answer questions and carry 3 marks each. f) Section D: Q. No. 31 to 33 are long answer questions carrying 5 marks each. g) There is no overall choice. However, internal choices have been provided. h) Use of calculators and log tables is not permitted. SECTION A (OBJECTIVE TYPE) 1. Read the passage given below and answer the following questions: (1x4=4) In phenols, the reaction that takes place on the aromatic ring are electrophilic substitution reactions. The -OH group attached to benzene rings activates it towards electrophilic substitution and directs the incoming groups to ortho- and para- positions in the ring. Nitration, halogenation and oxidation etc. are some common reactions that the phenols undergo. The following questions are multiple choice questions. Choose the most appropriate answer: (i) The OH group attached to the benzene ring makes the ortho- and para- positions (1) electron rich due to a) b) c) d) Nucleophilic attack Electrophilic substitution Resonance effect Lone pair of electrons (ii) What happen when the reaction of phenol with Bromine water gives ---------- (1) a) Monobromophenol b) 2,4,6-Tribromophenol Page 1 of 12

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