AP EAMCET Engineering 2013 Solved Paper

(a) Hybridised orbitals show only head on overlapping and thus form only σ bonds.
They never form π bonds.
(c) Head on overlapping is stronger than lateral or sideways overlapping. Therefore, the strength of bonds follows the order

πp−p

lateral‌overlapping

<

σs−s<σs−p<σp−p

head on overlapping of same shell

(d) s-orbitals are spherically symmetrical and thus show only head on overlapping and form only σ bonds.