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Chemistry Assertion (A) & Reason (B) MCQ

MODEL PAPER 5 · Rajasthan Board (RBSE) STD 12 Science (Rajasthan - English Medium). 4 questions.

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Assertion (A) & Reason (B) MCQ

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4 questions · timed · auto-graded

Question 11 Mark
Assertion (A): With excess of HI, glycerol ultimately gives isopropyl iodide.
Reason (R): The reaction occurs through intermediate formation of allyl iodide and propylene.
Answer
(a) Both A and R are true and R is the correct explanation of A.
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Question 21 Mark
Assertion (A): Vinyl halides do not give nucleophilic substitution reaction.
Reason (R): Vinyl group is electron donating in vinyl halides.
Answer
(c) A is true but R is false.
Explanation: A is true but R is false.
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Question 31 Mark
Assertion (A): Reactivity of ketones is more than aldehydes.
Reason (R): The carbonyl carbon of ketones is less electrophilic as compared to aldehydes.
Answer
(d) A is false but R is true.
Explanation:
The carbonyl carbon in aldehydes generally has a more partial positive charge than in ketones due to the electron-donating nature of alkyl groups. Aldehydes only have one e-donor group while ketones have two.
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Question 41 Mark
Assertion (A): D-glucose and D-mannose form same osazone with phenylhydrazine.
Reason (R): Osazone formation involves only the last four carbon atoms.
Answer
(c) A is true but R is false.
Explanation: A is true but R is false.
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Assertion (A) & Reason (B) MCQ - Chemistry STD 12 Science Questions - Vidyadip