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Question

In allene (C3H4), the type(s) of hybridisation of the carbon atoms, is (are)

A
sp and sp3
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B
sp and sp2
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C
only sp3
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D
sp2 and sp3
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Solution

The correct option is B sp and sp2
Allene is the name given to propdiene, H2C=C=CH2Allene.
Hybridisation of an atom is determined by determining the number of hybrid orbitals at that atom which is equal to the number of sigma (σ) bonds plus nubmer of lone pairs at the concerned atom.

Pi(π) bonds are not formed by hybrid orbitals, therefore, not counted for hybridisation.

Here, the terminal carbons have only three sigma bonds associated with them, therefore, hybridisation of terminal carbons is sp2 The central carbon has only two sigma bonds associated, hence hybridisation at central carbon is sp

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