Assertion (A) & Reason (B) MCQ

Question 11 Mark

Assertion (A): The nucleophilic substitution of vinyl chloride is difficult than ethyl chloride.
Reason (R): Vinyl group is an electron-donating group.

Answer

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Question 21 Mark

Assertion $(A):$ Isobutanal does not give the iodoform test.
Reason $(R):$ It does not have alpha-hydrogen.

Answer

Isobutanal does not give an iodoform test because it does not have the $-COCH_3$ group.

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Question 31 Mark

Assertion (A): Fructose can reduce Tollen's reagent.
Reason (R): Fructose is a ketone.

Answer

(b) Both A and R are true but R is not the correct explanation of A.
Explanation: Fructose does not contain an aldehyde group but still reduce Tollen's reagent. In presence of the dilute solution of alkali, fructose undergoes epimerization to form glucose and mannose.

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Question 41 Mark

Assertion $(A): 4-$nitrophenol is more acidic than $2, 4, 6-$trinitrophenol.
Reason $(R):$ Phenol is a weaker acid than carbonic acid.

Answer

Electron withdrawing groups such as $-NO_2, CN, - X,$ increase the acidity. Greater the number of electron-withdrawing groups more is the acidic character, $i.e. 2, 4, 6-$trinitrophenol is more acidic than $4-$nitrophenol.

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Chemistry Assertion (A) & Reason (B) MCQ

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