Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Heavy water is used for the study of reaction mechanism. Reason (R) : The rate

Question

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Heavy water is used for the study of reaction mechanism. Reason (R) : The rate of reaction for the cleavage of O-H bonds is slower than that of O–D bond. Choose the most appropriate answer from the options given below:

(A) Both (A) and (R) are true but (R) is not the true explanation of (A).
(B) (A) is false but (R) is true.
(C) (A) is true but (R) is false.
(D) Both (A) and (R) are true and (R) is the true explanation of (A). uhps nks dFku fn, gSaA ,d dk uke vfHkdFku (A) rFkk nwljs dk dkj.k (R) gSA. vfHkdFku (A) : Hkkjh ty dk mi;ksx jlk;fud vfHkfØ;k fØ;kfof/k ds v/;;u esa gksrk gSA dkj.k (R) : O–D vkcU/k dh rqyuk esa O–H vkcU/k ds fonyu dh vfHkfØ;k nj ean gSA uhps fn, fodYiksa esa ls lokZf/kd mi;qDr mÙkj pqusa % (1) nksuksa (A) rFkk (R) lgh gSa rFkk (A) dh lgh O;k[;k (R) ugha gSA (2) (A) lgh ugha gS ijUrq (R) lgh gSA (3) (A) lgh gS ijUrq (R) lgh ugha gSA (4) nksuksa (A) rFkk (R) lgh gSa rFkk (A) dh lgh O;k[;k (R) gSA

Prashant Kotian · Accepted Answer

Correct answer: C. Statement-1 : D2O is used as a moderator in nuclear reactor and in exchange reactions for the study of reaction mechanisms Statement-2 : Bond energy of O–H < Bond energy of O–D. So rate of reation of cleavage of O-H bond is faster than that of O-D bond.

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