InterviewSolution
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InterviewSolution
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Which of the following species does not exist under normal condition ?A. `Be_2^+`B. `Be_2`C. `B_2`D. `Li_2` |
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Answer» Correct Answer - B Key Idea Molecules with zero bond order , do not exist. According to molecular orbital theory, (a)`Be_2^+`(4+4-1=7) `=sigma1s^2 , overset***1s^2,sigma2s^2 , overset***2s^1` Bond order (BO) `=(4-3)/2=0.5` (b)`Be_2^+`(4+4=8) `=sigma1s^2 , overset***1s^2,sigma2s^2 , overset***2s^2` Bond order (BO) `=(4-4)/2=0` (c )`B_2^+`(5+5=10) `=sigma1s^2 , overset***1s^2,sigma2s^2 , overset***2s^1,pi2p_x^1~~pi2p_y^1` Bond order (BO) `=(6-4)/2=1` (d)`Li_2^+`(3+3=6) `=sigma1s^2 , overset***1s^2,sigma2s^2` Bond order (BO) `=(4-2)/2=1` Thus, `Be_2` does not exist under normal conditions. |
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