A) 0
B) 1
C) 2
D) 3
Correct Answer: A
Solution :
[a] In \[{{H}_{2}}C=C=C{{H}_{2}}\] hybridisation of C atoms is \[s{{p}^{2}}\] and sp. The molecule is monoplanar but \[H-\] atoms lie in different planes. See allene structure.
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