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Multiple Choice
Which of the following equations represents an addition reaction?
A
B
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D
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Step 1: Understand what an addition reaction is. In organic chemistry, an addition reaction involves two reactants combining to form a single product without any atoms being lost. Typically, this occurs with molecules containing double or triple bonds, where the multiple bond is broken and new single bonds are formed.
Step 2: Analyze each given equation to identify whether it fits the criteria of an addition reaction. Look for a reactant with a double or triple bond and check if the product has that bond replaced by single bonds with added atoms.
Step 3: For the first equation, observe that it shows an alcohol converting into an alkene and water. This is a dehydration reaction, which is an elimination reaction, not an addition.
Step 4: For the second equation, note that it involves an alkyl halide reacting with potassium hydroxide to form an alkene, potassium chloride, and water. This is a substitution or elimination reaction, not an addition.
Step 5: For the third equation, check if a molecule with a double bond reacts with another molecule (like H2) to form a saturated molecule. This fits the definition of an addition reaction, where the double bond is broken and atoms are added across it.