Q.

Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

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a

Both (A) and (R) are true but (R) is not the correct explanation of (A)

b

Both (A) and (R) are true and (R) is the correct explanation of (A)

c

Both (A) and (R) are false

d

(A) is true but (R) is false

answer is C.

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Detailed Solution

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A is true : single bond between  oxygen and oxygen is weaker due lone pair lone pair repulsions, therefore single bond is much weaker than double bond, i.e sum of two single bonds energy is less than one double bond.

R is false : because sigma bond is always stronger than pi bond , due to greater extent of overlapping. 

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Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).