Step 1: Understanding Unsaturated Hydrocarbons
Unsaturated hydrocarbons are those that contain one or more double or triple bonds between carbon atoms. The most common unsaturated hydrocarbons are alkenes and alkynes.
Step 2: Explanation of Other Options
- (A) CH\(_4\) is methane, which is a saturated hydrocarbon (alkane).
- (C) C\(_3\)H\(_8\) is propane, another saturated hydrocarbon (alkane).
- (D) C\(_4\)H\(_{10}\) is butane, a saturated hydrocarbon (alkane).
Thus, the correct answer is (B) C\(_2\)H\(_4\), which is ethene, an unsaturated hydrocarbon.
Find the unknown frequency if 24 is the median of the following frequency distribution:
\[\begin{array}{|c|c|c|c|c|c|} \hline \text{Class-interval} & 0-10 & 10-20 & 20-30 & 30-40 & 40-50 \\ \hline \text{Frequency} & 5 & 25 & 25 & \text{$p$} & 7 \\ \hline \end{array}\]
Two concentric circles are of radii $8\ \text{cm}$ and $5\ \text{cm}$. Find the length of the chord of the larger circle which touches (is tangent to) the smaller circle.