Question:
What is the general molecular formula for alkenes?
What is the general molecular formula for alkenes?
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Alkenes have one C=C bond, so they have two hydrogens fewer than the alkane with the same number of carbons.
Updated On: Nov 12, 2026
- \(\text{C}_{n}\text{H}_{2n+2}\)
- \(\text{C}_{n}\text{H}_{2n}\)
- \(\text{C}_{n}\text{H}_{2n-2}\)
- \(\text{C}_{n}\text{H}_{n}\)
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept
An alkane has the formula \(\text{C}_{n}\text{H}_{2n+2}\). A double bond removes two hydrogen atoms.
Step 2: Calculation
\(\text{C}_{n}\text{H}_{2n+2}-2\text{H}=\text{C}_{n}\text{H}_{2n}\).
Step 3: Check with examples
Ethene is \(\text{C}_{2}\text{H}_{4}\) and propene is \(\text{C}_{3}\text{H}_{6}\), both fitting \(\text{C}_{n}\text{H}_{2n}\).
Final Answer:
The general formula of alkenes is \(\text{C}_{n}\text{H}_{2n}\). \[ \boxed{\text{(B) }\text{C}_{n}\text{H}_{2n}} \]
An alkane has the formula \(\text{C}_{n}\text{H}_{2n+2}\). A double bond removes two hydrogen atoms.
Step 2: Calculation
\(\text{C}_{n}\text{H}_{2n+2}-2\text{H}=\text{C}_{n}\text{H}_{2n}\).
Step 3: Check with examples
Ethene is \(\text{C}_{2}\text{H}_{4}\) and propene is \(\text{C}_{3}\text{H}_{6}\), both fitting \(\text{C}_{n}\text{H}_{2n}\).
Final Answer:
The general formula of alkenes is \(\text{C}_{n}\text{H}_{2n}\). \[ \boxed{\text{(B) }\text{C}_{n}\text{H}_{2n}} \]
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