In the series of ethane, ethylene and acetylene, the ${C}-{H}$ bond energy is —
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In the series of ethane, ethylene and acetylene, the ${C}-{H}$ bond energy is —

In the series of ethane, ethylene and acetylene, the ${C}-{H}$ bond energy is —
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In the series of ethane, ethylene and acetylene, the ${C}-{H}$ bond energy is

(a) the same in all the three compounds

(b) greatest in ethane

(c) greatest in ethylene

(d) greatest in acetylene.

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As the bond order increases, $\mathrm{C}-\mathrm{H}$ bond energy also increases so it will be greatest in acetylene because bond order of ethane, ethylene and acetylene is 1,2 and 3 respectively.

So, The correct option of this question is (D)

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