If at $298 K$ , the bond energies of $C - H, C - C, C = C$ and $H - H$ bonds are $414$ , $347$ , $615$ and $435 k J / m o l$ respectively, then the value of enthalpy change for the reaction $H_{2} C = C H_{2} (g) + H_{2} (g) \to H_{3} C - C H_{3} (g)$ at $298 K$ will be:

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If C - C (I), C = C(II) and C ≡ C (III) are three bond types, then their bond lengths will be respectively,

The correct option is A I > II > III Generally, if two same covalently bonded atoms are there with single, double and triple bonds, then we can say that for bond lengths that single Bond > Double bond > Triple bond Bond order∝1Bond length

The correct option is A
I > II > III

Generally, if two same covalently bonded atoms are there with single, double and triple bonds, then we can say that for bond lengths that single Bond > Double bond > Triple bond

$B o n d o r d e r \propto \frac{1}{B o n d l e n g t h}$