MCQ
The $C - H$ bond length is minimum in the bond formed by
- ✓$sp - s$ overlapping (as in alkynes)
- B$s{p^2} - s$ overlapping (as in alkenes)
- C$s{p^3} - s$ overlapping (as in alkanes)
- DNone of these
Bond length decreases with the increase in $s$ character since an $s$-orbital is smaller than a $p$ - orbital.
| Compound | Hybridization | $C$ - $H$ bond length $\mathring A)$ |
| Alkane | $sp ^3$ | $1.093$ |
| Alkene | $sp ^2$ | $1.087$ |
| Alkyne | $s p$ | $1.057$ |
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Statement $I$ : The boiling point of three isomeric pentanes follows the order
n-pentane $>$ isopentane $>$ neopentane
Statement $II$ : When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point.
In the light of the above statements, choose the most appropriate answer from the options given below: