Question

Ethyne into acetaldehydration

Answer 1

The bond angle or shape depends on hybridization:

Alkane has sp3 hybridization. Their bond angle is 109.28 and have tetrahedral geometry.

Alkenes have sp2 hybridization. Their bond angle is 120 and triagonal planar shape.

Alkynes have sp hybridization. Their bond angle is 180 and have linear shape.