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AP EAMCET Engineering 2013 Solved Paper

Section: Chemistry

Question : 45 of 160

Marks: +1, -0

Which one of the following statements is correct?

Hybrid orbitals do not form $\sigma$ bonds
Lateral overlap of $p$ -orbitals or $p$ - and $d$ -orbitals produces $\pi$ -bonds
The strength of bonds follows the order
$\sigma_{p-p} < \sigma_{s-s} < \pi_{p-p}$
s-orbitals do not form $\sigma$ bonds

Solution:

(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

\pi_{p-p_{\text{lateraloverlapping}}} < {\sigma_{s-s} < \sigma_{s-p} < \sigma_{p-p}}_{\text{head on overlapping of same shell}}

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

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