MCQ
$C-H$ bond length is greatest in
- A${C_2}{H_2}$
- B${C_2}{H_4}$
- ✓${C_2}{H_6}$
- D${C_2}{H_2}B{r_2}$
✓
Answer
Correct option: C.
${C_2}{H_6}$
c
Bond length is defined as the distance between two atoms that are participating in a bond.
Bond length is defined as the distance between two atoms that are participating in a bond.
We can also understand the bond length with the help of the $s$ character.
Higher the $s$-character lesser is the bond length.
This is because higher $s$ character implies that the electrons that are bonded pairs are closely held together, thus making the bond length small as well as strong.
Hybridisation of $C _2 H _6$ is $sp ^3$
The $s$ character in $C _2 H _6$ (Ethane) is: $\frac{1}{4} \times 100=25 \,\%$ which is the least amongst the other given compounds.
Therefore the $C - H$ bond length of $C _2 H _6$ is the longest.
Hence it is the correct option.
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