Question

Questions 16 to 20 :<br />(A) Both Assertion (A) and Reason (R) are correct statements, and<br />Reason (R) is the correct explanation of the Assertion (A).<br />(B) Both Assertion (A) and Reason (R) are correct statements, but<br />Reason (R) is not the correct explanation of the Assertion (A).<br />(C) Assertion (A) is correct, but Reason (R) is wrong statement.<br />(D) Assertion (A) is wrong, but Reason (R) is correct statement.<br />16. Assertion (A) : F, is a strong oxidising agent.<br />Reason (R) : Electron gain enthalpy of fluorine is less negative.<br />17. Assertion (A) : (CH2)C-O-CH2 gives (CHR) C-I and CH OH on<br />treatment with HI. A<br />Reason (R) : The reaction occurs by Snl mechanism.<br />18. Assertion (A) : Transition metals have low melting points.<br />Reason (R) The involvement of greater number of (n - 1)d and ns<br />electrons in the interatomic metallic bonding.<br />19. Assertion (A) : Hydrolysis of an ester follows first order kinetics.<br />Reason (R) Al Concentration of water remains nearly constant during<br />the course of the reaction.<br />20. Assertion (A) : Benzoic acid does not undergo Friedal-Crafts reaction.<br />Reason (R) : The carboxyl group is activating and undergo electrophilic<br />substitution reaction.<br />​

Answer 1

16. B) Both Assertion and Reason are correct statements , but Reason is not the correct explanation of Assertion.

• The Strong Oxidizing power of Florine is due to its small size and high electronegativity, which creates the electron-electron repulsion inside the atom. Leading to easy reduction of Florine itself or in other words easy oxidation of other atom.

17) A) Both Assertion and Reason are correct statements , and Reason is  the correct explanation of Assertion.

18) D) Assertion is wrong but Reason is correct.  

• Transition metals have higher melting points till middle of the series, then their melting point decreases. This is due the number of lone pairs in the metal, which makes the metal more stronger.

19) A) Both Assertion and Reason are correct statements , and Reason is  the correct explanation of Assertion.

20) C) Assertion is true, but reason is wrong.

• The Carboxylic group being an electron withdrawing group, makes the ring deactivating, thus it shows less tendency towards electrophilic substitution by Friedal craft reaction.