Statement-I: CH₄ has planar structure, C₂H₄ has three dimensional structure and C₂H₂ has angular structure.
Statement-II: H – C – H angles in CH₄, C₂H₄ and C₂H₂ respectively are 109^o28', 116.6^o and 180^o.

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Statement-I is correct and statement-II is incorrect

Statement-I is incorrect and statement-II is correct

Both statement-I and statement-II are incorrect

Both statement-I and statement-II are correct

answer is C.

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Detailed Solution

Methane has three dimensional tetrahedral structure, C₂H₄ has planar structure while C₂H₂ is a linear molecule. Their corresponding H-C-H bond angles are $109 ° 28', 116.6 °, and 180 ° respectively .$

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