n. This part is Optional, your instructor will tell you if you are expected to c

Question

n. This part is Optional, your instructor will tell you if you are expected to complete it. Procedure: Use the Spartan computer program the following molecules: C:H,G·cm siCla. No, Po, o determine the estimated bond length and bond angles in nswer the following questions w does the length of a single bond differ from a double or triple bond? ( look at C,Hs, CHa, CHel do non-bonding electrons have on expected bond angles (Compare SiCl, with NCI) 2. 3. What affect size of atom affect bond length? (look at SiCl NChs, PCh)

Explanation / Answer

Q1) The bond length depends on the strength of the bonds. The stronger bonds will have atoms connected more strongly and closely leading to a shorter bond length whereas the atoms combined with less strength will have longer bond length.

The bond length order will be C2H6 > C2H4 > C2H2

C-C has bond length of 156 pm (Classbook data)

C=C has bond length of 136 pm

C(triple bond)C has bond length of 120 pm

Q2) The bond length can be defined as the sum of radii of two center and surrounding atom, since the size of phosphorus is greater tha nitrogen, hence PCl3 will have higher bond length than NCl3

Phosphorus has smaller size than Silicon since size decreases down the group, hence the correct order must be

SiCl4 > PCl3 > NCl3

3) The presence of lone pair on central atom will repel the shared electrons leading to the decrease in bond angle

Hence answer will be NCl3 (bond angle) > SiCl4 (bond angle)

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