In isolated condition $C - C$ bond length of $C_{2} H_{4}$ is $x$ , than the bond length of $C - C$ bond of $C_{2} H_{4}$ in Zeise's salt is:

greated than

x

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less than

x

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equal to

x

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none of these

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Solution

The correct option is A greated than $x$
In isolated condition $C - C$ bond length of $C_{2} H_{4}$ is $x$ , than the bond length of $C - C$ bond of $C_{2} H_{4}$ in Zeise's salt is greater than $x$ .

Zeise's salt is potassium trichloro(ethene)platinate(II) having formula $K [P t C l_{3} (C_{2} H_{4})] \cdot H_{2} O$

The pi electrons of ethylene are donated to $P t$ . Due to this, $C - C$ bond order decreases and $C - C$ bond length increases.

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⎧ ⎪ ⎪ ⎪ ⎪ ⎨ ⎪ ⎪ ⎪ ⎪ ⎩ \begin{matrix} C - C bond length in ethane is 1.54 \circ A C = C bond length in ethene is 1.34 \circ A C \equiv C bond length in ethyne is 1.20 \circ A \end{matrix} ⎫ ⎪ ⎪ ⎪ ⎪ ⎬ ⎪ ⎪ ⎪ ⎪ ⎭

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