Which statement best describes the structure of the allene molecule, $H_{2} C = C = {CH}_{2}$ ?

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The C atoms form an angle of 180° and the two ${CH}_{2}$ groups are perpendicular to one another

The C atoms form an angle of 120° and the H atoms lie in the same plane as the C atoms.

The C atoms form an angle of 120° and the H atoms lie in a plane perpendicular to that of the C atoms.

The C atoms form an angle of 180° and the four H atoms lie in the same plane

answer is D.

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Detailed Solution

The C atoms form an angle of 180° and the two ${CH}_{2}$ groups are perpendicular to one another

Allene has two double bonds, which result in two methylene groups positioned 90 degrees apart.

The twofold rotation axis and the primary symmetry axis are colinear at -4.

Two twofold axes that are split in half by two mirror planes are perpendicular to the -4 axis.

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