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  4. Gem dihalides on treatment with alcoholic KOH give

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Q. Gem dihalides on treatment with alcoholic $KOH$ give

AMUAMU 2003

Solution:

Gem dihalide When the two halogen atoms are attached to the same carbon atom. Vicinal dihalide When the two halogen atoms are on adjacent carbon atoms.
Gem dihalide or vicinal dihalide gives alkyne on treating with alcoholic $KOH$
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Gem dihalide on hydrolysis with (aq.) $KOH$ can produce aldehydes and ketones.
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While vinical dihalide gives alcohol with (aq.) $KOH$
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Therefore, gem and vicinal dihalide can be distinguished by(aq.) $KOH$