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Bond Order and Enthalpy

Among C2H4 ...

Question

Among $C_{2} H_{4}$ and $C_{2} H_{2}$ ,
(A) Which has a greater $C - C$ bond distance?
(B) Which has a greater $C - C$ bond energy?

C_{2} H_{4}

; B.

C_{2} H_{2}

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C_{2} H_{2}

; B.

C_{2} H_{4}

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Can't be predicted

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Data insufficient

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Solution

The correct option is A A. $C_{2} H_{4}$ ; B. $C_{2} H_{2}$
Among ethylene $C_{2} H_{4}$ and acetylene $C_{2} H_{2}$ , (A) ethylene $C_{2} H_{4}$ has a greater $C - C$ bond distance and (B) acetylene $C_{2} H_{2}$ has a greater $C - C$ bond energy. Higher is the bond order, more stronger is the bond. Hence, higher is the bond energy and lower is the bond length.The bond orders of ethylene $C_{2} H_{4}$ and acetylene $C_{2} H_{2}$ are 2 and 3 respectively.

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