Question

in homologous series 2 consecutive hydrocarbons differ by? 12u 13u 14u

Answer 1

Explanation:

Two consecutive homologues differ by 1 carbon atom and 2 hydrogen atoms in their molecular formulae.

Answer 2

Answer:

(c) 14 u

Explanation:

With reference to the molecular mass, each consecutive (one after the other) hydrocarbon differs by a molecular mass of 14 u.

This is because:

They differ by $CH_{2}$ molecular formula.

∴ The mass of 1 carbon atom and the mass of 2 hydrogen atoms add up as follows:

• Mass of 1 carbon atom = 12 u
• Mass of 2 hydrogen atoms = 2(1) u = 2u  

⇒ Mass of carbon + Mass of hydrogen = 12u + 2u

⇒ Mass of carbon + Mass of hydrogen = 14 u

Hope you got that.

Thank You.