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Multiple Choice
Which C–H bond is the longest?
A
D
B
A
C
C
D
B
Verified step by step guidance
1
Identify the type of hybridization of the carbon atom to which each hydrogen is attached. The hybridization affects the bond length.
For bond A, the hydrogen is attached to a carbon with sp hybridization, which is part of a triple bond.
For bond B, the hydrogen is attached to a carbon with sp2 hybridization, which is part of a double bond.
For bond C, the hydrogen is attached to a carbon with sp3 hybridization, which is part of a single bond.
For bond D, the hydrogen is attached to a carbon with sp2 hybridization, which is part of a double bond. Compare the bond lengths: sp3 C-H bonds are generally longer than sp2 and sp C-H bonds.