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B
P-2; Q-4; R-1; S-3
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C
P-4; Q-2; R-1; S-3
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D
P-2; Q-1; R-3; S-4
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Solution
The correct option is B P-2; Q-4; R-1; S-3 Alkynes are unsaturated hydrocarbons having a triple bond between two carbon atoms. Hence, the formula is CnH2n−2. Alcohol is a functional group where −OH is attached to a carbon atom. An alkyl halide is an organic compound where a halogen atom is attached to the carbon atom instead of hydrogen. Alkenes are unsaturated hydrocarbons having a double bond between two carbon atoms. Thus, the general formula is CnH2n.