Question

Bromo, iodo and polychloro derivatives of hydrocarbons are heavier than water. (True/False)

Hint:

The middle row of any AP with an odd number of terms is always the average of the first and last terms: $(101+1)/2 = 51$.

Answer 1

Concept:
The density of organic compounds depends on the atoms present in the molecule. Halogen atoms like chlorine, bromine, and iodine have higher atomic masses compared to hydrogen.
Explanation:

Hydrocarbons contain mainly carbon and hydrogen, so they are usually lighter than water.
When halogens (Cl, Br, I) replace hydrogen atoms, molecular mass increases significantly.
Bromo and iodo compounds especially have high densities due to heavy halogen atoms.
Polychloro derivatives (e.g., chloroform, carbon tetrachloride) are also denser than water.
Examples:

Chloroform (\(CHCl_3\)) – denser than water
Carbon tetrachloride (\(CCl_4\)) – sinks in water
Bromoform (\(CHBr_3\)) – very dense liquid
Conclusion:
Hence, the statement is correct. \[ \boxed{\text{True}} \]