Which is the general formula of the alkenes?
Answer and explanation
Correct answer: D. CnH2n
- Step 1: Alkenes have one double bond, so they have two fewer hydrogens than the alkane. Answer: CnH2n. Why not the others: CnH2n+2: That is the formula of the alkanes. CnH2n-2: That is the formula of the alkynes. CnHn: That is the formula of some aromatic compounds.
Practise more Electrolysis, organic chemistry and environmental chemistry.
Free questions with an explanation for every one, and full timed Kenya KCSE mock tests.
More Electrolysis, organic chemistry and environmental chemistry questions
- What is produced at the cathode when concentrated sodium chloride solution (brine) is electrolysed?
- In the electrolysis of copper(II) sulphate with copper electrodes, what happens at the anode?
- A current of 2 A flows for 965 seconds through copper(II) sulphate solution. What mass of copper is deposited at the cathode? (1 Faraday = 9…
- Which test distinguishes an alkene from an alkane?
- How many carbon atoms are in a molecule of butane?
- Which gas is mainly responsible for the formation of acid rain?