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The strength of bonds by 2s -2s, 2p2p an...

The strength of bonds by 2s -2s, 2p2p and 2p-2s overlap has the order

A

`s-s gt p-p gt p-s`

B

`s-s gt p-s gt p-p`

C

`p-p gt p-s gt s-s`

D

`p-p gt s-s gt p-s`

Text Solution

AI Generated Solution

The correct Answer is:
To determine the strength of bonds formed by the overlap of 2s-2s, 2p-2p, and 2p-2s orbitals, we can analyze the extent of overlap for each type of orbital interaction. Here's a step-by-step solution: ### Step 1: Understand Orbital Overlap Orbital overlap is crucial in determining the strength of a bond. The greater the overlap between orbitals, the stronger the bond formed. We will compare three types of overlaps: 2s-2s (ss), 2p-2p (pp), and 2p-2s (sp). ### Step 2: Analyze 2p-2p Overlap (pp) The 2p-2p overlap involves two p orbitals. The p orbitals can overlap side-by-side or end-to-end. The side-by-side overlap (which is the most effective) allows for a significant extent of overlap, leading to a strong bond. Therefore, the pp overlap is the strongest among the three types. ### Step 3: Analyze 2p-2s Overlap (sp) The 2p-2s overlap involves one p orbital and one s orbital. The overlap between an s orbital and a p orbital is less effective than the overlap between two p orbitals. The s orbital has a spherical shape, while the p orbital has a dumbbell shape, which results in a lower extent of overlap compared to pp overlap. Thus, the sp overlap is weaker than pp overlap. ### Step 4: Analyze 2s-2s Overlap (ss) The 2s-2s overlap involves two s orbitals. The overlap between two s orbitals is the least effective because the spherical shape of the s orbitals does not allow for significant overlap. Therefore, the ss overlap is the weakest among the three types. ### Step 5: Establish the Order of Bond Strength Based on the analysis: - The strongest overlap is from 2p-2p (pp). - The next strongest is from 2p-2s (sp). - The weakest is from 2s-2s (ss). Thus, the order of bond strength based on overlap is: **pp > sp > ss** ### Final Answer The strength of bonds by 2s-2s, 2p-2p, and 2p-2s overlap has the order: **pp > sp > ss**. ---
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