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JEE Main 20231 FebruaryEvening Shift
Exam
JEE Main
Year
2023
Date
1 February
Shift
Evening Shift
Subject
Chemistry
Chapter
p Block Elements (Group 13 & 14)

JEE Main 2023 · 1 February · Evening Shift · Chemistry · p Block Elements (Group 13 & 14)

The correct order of bond enthalpy ( kJ mol ^ – 1 ) is:

The correct order of bond enthalpy (kJmol–1kJ{mol}^{– 1}) is:

Options

  1. ASi−Si>C−C>Sn−Sn>Ge−GeSi - Si > C - C > Sn - Sn > Ge - Ge
  2. BSi−Si>C−C>Ge−Ge>Sn−SnSi - Si > C - C > Ge - Ge > Sn - Sn
  3. CC−C>Si−Si>Sn−Sn>Ge−GeC - C > Si - Si > Sn - Sn > Ge - Ge
  4. DC−C>Si−Si>Ge−Ge>Sn−SnC - C > Si - Si > Ge - Ge > Sn - Sn

Correct answer

D. C−C>Si−Si>Ge−Ge>Sn−SnC - C > Si - Si > Ge - Ge > Sn - Sn

Step-by-step solution

As bond length increases, bond energy decreases.

Bond Bond energy (kJ mol-1)
C - C 348
Si - Si 297
Ge - Ge 260
Sn - Sn 240

So, bond enthalpy order C−C>Si−Si>Ge−Ge>Sn−SnC - C > Si - Si > Ge - Ge > Sn - Sn

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