In allene structure, three carbon atoms are joined by: $\begin{array}{*{35}{l}} \left( \text{A} \right)\text{ three }\sigma \text{and three }\pi \text{ bond} \\ \left( \text{B} \right)\text{ two }\sigma \text{ and one }\pi \text{ bond} \\ \left( \text{C } \right)\text{ two }\sigma \text{ and two }\pi \text{ bonds} \\ \left( \text{D} \right)\text{ three }\pi \text{ bonds only} \\\end{array}$

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Hint: Ene indicates an alkene group which confirms presence of one double bond and allene are organic compounds in which one central carbon atom has double bonds with adjacent carbon atoms.
- The Hybridization of the Central Carbon atom in allene is sp. Hybridization of terminal carbon atoms is $s{{p}^{2}}$.
- The Electronic configuration of carbon atom in ground state is $1{{s}^{2}}2{{s}^{2}}2{{p}^{2}}$.
- The electronic configuration of carbon atoms in excited state is $1{{s}^{2}}2{{s}^{1}}2{{p}^{3}}$.
- For terminal carbon atoms, one 2s orbital and two 2p form three $s{{p}^{2}}$ orbitals and one p orbital remains unhybridized.