Question

The hybridisation of 1st and 2nd carbon atoms in propadiene is

but they not only given sp2 in options ​

Answer 1

CH
2
​
=C=CH
2
​

In propadiene, each of two electrons of the central atom forms collinear sp σ bonds to the terminal sp
2
-hybridized carbons. The two remaining electrons of the central carbon occupy p orbitals and form π bonds through an overlap of these p orbitals and the p orbitals of the terminal carbons.
First carbon shows sp
2
hybridization and second carbon shows sp hybridization.