Chemistry · Organic chemistry: basic principles and techniques · chapter 8 of 9

Class 11 Chemistry Chapter 8: Organic Chemistry – Some Basic Principles and Techniques Assertion-reason questions with answers

2 assertion-reason questions on Organic Chemistry – Some Basic Principles and Techniques, each with its answer and the reason, written from the NCERT chapter. For school exams on the CBSE pattern, JEE Main and NEET, which are set from the same NCERT chapter. Open a question's solution to check your working; then take the free test to find your next chapter. Each question gives an Assertion (A) and a Reason (R); choose how they stand to each other.

Question 1
Assertion (A): In 1-chloropentane the inductive effect of the chlorine atom on carbon-5 is practically zero. Reason (R): The inductive effect decreases rapidly as the number of intervening bonds increases and becomes vanishingly small after three bonds.
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Answer: (a) Both A and R are true, and R is the correct explanation of A.

Carbon-5 is four bonds away from Cl, beyond the three-bond range, so A is true and follows from R.

Question 2
Assertion (A): In paper chromatography the stationary phase is the water trapped in the chromatography paper. Reason (R): In paper chromatography the mobile phase rises up the paper by capillary action.
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Answer: (b) Both A and R are true, but R is not the correct explanation of A.

Both statements are true, but the rise of the solvent by capillary action does not explain what the stationary phase is; that comes from the water held in the paper.

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