Using the data in Table 2.2, determine which of the following covalent single bonds is polar and (if appropriate) in which direction the dipole moment acts. 

(a) N—H; 

(b) F—Br; 

(c) C—H; 

(d) P—Cl;

(e) N—Br.

Table 2.2

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Group 1 I H 2.2 Li 1.0 Na 0.9 K 0.8 Rb 0.8 Cs 0.8 Group 2 Be 1.6 Mg 1.3 Ca 1.0 Sr 0.9 Ba 0.9 (d-block elements) Group 13 B 2.0 Al(III) 1.6 Ga(III) 1.8 In(III) 1.8 TI(I) 1.6 TI(III) 2.0 Group 14 с 2.6 Si 1.9 Ge(IV) 2.0 Sn(II) 1.8 Sn(IV) 2.0 Pb(II) 1.9 Pb(IV) 2.3 Group 15 N 3.0 P 2.2 As(III) 2.2 Sb 2.1 Bi 2.0 Group 16 O 3.4 S 2.6 Se 2.6 Te 2.1 Po 2.0 Group 17 F 4.0 CI 3.2 Br 3.0 I 2.7 At 2.2