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  4. Assertion: All the hydrogen atoms in CH2=C=CH2 lie in one plane. Reason: All the carbon atoms in its are sp2 hybridized.

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Q. Assertion : All the hydrogen atoms in CH2$=$C$=$CH2 lie in one plane.
Reason : All the carbon atoms in its are $sp^2$ hybridized.

AIIMSAIIMS 2014Hydrocarbons

Solution:

The two H-atoms on first carbon and the two H-atoms on the third carbon atom lie in perpendicular planes. The central carbon atom is sp-hybridized while terminal carbon atoms are sp2-hybridized.