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Q.

How many 'sp' hybrid orbitals are there in allene C3H4 ?

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answer is 2.

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Detailed Solution

Allene: H2​C=C=CH2​. The central carbon is attached to other carbons by two sigma and two pi bonds so it's hybridisation will be sp. 

The terminal carbon is attached to other carbon and hydrogen by 3 sigma and 1 pi bonds and hence, it's hybridisation will be sp2.

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