N-N single bond enthalpy is “X”. N = N double bond enthalpy is “Y”. Correct relation is

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X > 2Y

2X > Y

2X < Y

2X = Y

answer is C.

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Detailed Solution

Generally A) a single bond is a sigma bondB) a double bond has one sigma and one pi bondC) a pi bond is weaker than a sigma bondApplying to the given questionExpected--N–N single bond enthalpy = X∴“2X” denotes two sigma bond enthalpy values‘Y’ denotes double bond enthalpy (one sigma bond and one pi bond)Since pi bond is weaker than sigma bond2X > YBut in the case of nitrogen N. . − N. . single bond is too weak due to the repulsions between lone pairs of adjacentStrength of two sigma bonds, 2 N–N < strength of double bond (N = N )∴2X < Y

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