1.

Arrange the following bonds in decreasing order of bond strength : C-N, C=N, C≡N

Answer»

C≡N > C=N > C-N

Note : 

Average bond lengths for some single, double and triple bonds :

Type of bondCovalent bond length (pm)
O-H96
C-H107
N-O136
C-O143
C-N143
C-C154
C=C121
N=O122
C=C133
C=N138
C≡N116
C≡C120
Type of bondCovalent bond length (pm)
H2(H-H)74
F2(F-F)144
Cl2(Cl-Cl)199
Br2(Br-Br)228
I2(I-I)267
N2(N≡N)109
O2(O-O)121
HF (H-F)92
HCl (H-Cl)127
HBr (H-Br)141
HI (H-I)160


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