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-I Effect

Predict the c...

Question

Predict the correct order of $- I$ strength for the following groups:
$I . - C H_{2} N H_{2} I I . - C H = N H I I I . - C N$

I > I I > I I I

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I I I > I I > I

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I > I I I > I I

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I I I > I > I I

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Solution

The correct option is B $I I I > I I > I$
More the % s-character, more will be the electronegativity of the attached carbon. Hence more will be the strength of $- I$ effect.
$- C s p \equiv N > - C s p^{2} H = N H > - C s p^{3} H_{2} - N H_{2}$
Therefore, the correct order for the $- I$ strength is:
$- C \equiv N > - C H = N H > - C H_{2} - N H_{2}$

Hence option (b) is the correct answer.

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