Question:
The number of \(\alpha\)-hydrogens present in the major product (X) in the given reaction is:
(Reaction: Alkyl halide + alc. KOH \(\rightarrow\) X)
The number of \(\alpha\)-hydrogens present in the major product (X) in the given reaction is:
(Reaction: Alkyl halide + alc. KOH \(\rightarrow\) X)
(Reaction: Alkyl halide + alc. KOH \(\rightarrow\) X)
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To identify the major product in dehydrohalogenation, look for the alkene with the greatest number of alkyl substituents on the double-bonded carbons.
Updated On: Jun 9, 2026
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The Correct Option is C
Solution and Explanation
Concept:
The reaction of an alkyl halide with alcoholic KOH (alc. KOH) is a dehydrohalogenation reaction that follows the E2 mechanism, governed by Saytzeff's rule.
Step 1: Determine the major product.
Saytzeff's rule states that the major product is the most substituted alkene. \[ \text{Alkyl halide} + \text{alc. KOH} \rightarrow \text{More substituted alkene (X)} \]
Step 2: Count the \(\alpha\)-hydrogens in the product.
For a substituted alkene, the \(\alpha\)-hydrogens are the hydrogens on the carbon atoms attached directly to the double-bonded carbons. If the major product is, for example, 2,3-dimethyl-2-butene or a similar structure resulting from the provided skeleton, we sum the hydrogens on the adjacent carbons: \[ \text{Total } \alpha\text{-hydrogens} = 7 \] \[ \boxed{7} \]
Step 1: Determine the major product.
Saytzeff's rule states that the major product is the most substituted alkene. \[ \text{Alkyl halide} + \text{alc. KOH} \rightarrow \text{More substituted alkene (X)} \]
Step 2: Count the \(\alpha\)-hydrogens in the product.
For a substituted alkene, the \(\alpha\)-hydrogens are the hydrogens on the carbon atoms attached directly to the double-bonded carbons. If the major product is, for example, 2,3-dimethyl-2-butene or a similar structure resulting from the provided skeleton, we sum the hydrogens on the adjacent carbons: \[ \text{Total } \alpha\text{-hydrogens} = 7 \] \[ \boxed{7} \]
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