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Consider the following statement(s) for $\overset{∙}{C} H_{3} = X and \overset{∙}{C} F_{3} = Y$
(I) When X dimerizes bond angle decreases
(II) When X dimerizes bond angle increases
(III) In X - Y molecule C - C bond length is less than that in Y - Y molecule
(IV) Bond angle in X is greater than that in Y.
Pick the incorrect statements.

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II, III

I, II, III

I, IV

II, III, IV

answer is A.

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Detailed Solution

In $\overset{∙}{C} H_{3} bond angle \approx 1200 ({sp}^{2} - hybridisation) .$

In $\overset{∙}{C} F_{3} bond angle < 109^{0} ({sp}^{3} - hybridisation) .$

In $C_{2} H_{6} carbon is {sp}^{3} hybrid so bond angle decreases to \approx 109^{0} .$

so bond length decreases in $C_{2} F_{6} .$

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