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What is a general formula of alkynes?

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in Chemistry – Class 11 by (148k points)
What is a general formula of alkynes?

(a) CnH2n-2

(b) CnHn-2

(c) CnH2n

(d) CnH2n+2

This question was addressed to me by my school teacher while I was bunking the class.

This intriguing question originated from Hydrocarbons in division Hydrocarbons of Chemistry – Class 11

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The correct answer is (a) CnH2n-2

The explanation: Alkynes are unsaturated hydrocarbons with the general formula of CnH2n-2. Few examples are ethyne (put n = 2 in the general formula) C2H2, propyne (put n = 3 in the general formula) C3H4, butyne (put n = 4 in the general formula) C4H6 etc.

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