? 21. Which of the following has the bonds ranked in correct order in terms 0-8

Question

? 21. Which of the following has the bonds ranked in correct order in terms 0-8 N-H,F-5. ?-?, 3.5, N 3.0, Br and N Br) 2.8, S-2.5, H-2.1 polar to the least polar? (bonds Electronegativity values: F 4.0, o a. F-S, O-H, 0-S. N-H, N-Br e. None of the above is correct 22. Which of the following statements regarding covalent bonds is false? a. Double bonds are formed from two atoms sharing two pairs of electrons s are formed from two atoms sharing three pairs of electrons c. Double bonds fo d. Triple bonds form mostly from C, N, and O atoms e. Single bonds are formed from two at ?. N. O, and s atorns. capable of forming single bonds are H, F, CI, O, S, C, and N

Explanation / Answer

21.We can predict the bond polarity or can predict that the bond is non polar , polar covalent or ionic.

We need to remeber the fact that , the greater the difference in electronegativity the more polar the bond.

BOND Electronegativity Difference in electronegativity

O-S 3.5-2.5 = 1.0

N-H 3.0-2.1 = 0.9

F-S 4.0-2.5 = 1.5

O-H 3.5-2.1 = 1.4

N-Br 3.0-2.8 = 0.2

From the above data , the order of polarity of bond is F-S > O-H > O-S > N-H >N-Br

Therefore, option a is correct.

22. All the options are correct.Option e is false because single bonds can be formed by almost all the atoms.

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