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Question
Which of the following compounds are gem-dihalides?
(i) Ethylidene chloride
(ii) Ethylene dichloride
(iii) Methylene chloride
(iv) Benzyl chloride
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Solution
(i) Ethylidene chloride
(iii) Methylene chloride
Explanation:
Gem-dihalides are those dihalides in which two halogen atoms are bonded to the same carbon atom.
(i) \[\ce{\underset{Ethylidene chloride}{Cl2 - CH - CH3}}\]
(ii) \[\ce{\underset{Ethylene dichloride}{Cl - H2C - CH2 - Cl}}\]
(iii) \[\ce{\underset{Methylene chloride}{CH2Cl2}}\]
(iv)
Benzyl chloride
So, in (i) and (iii) two halogen atoms are present on the same carbon atom and they are termed gem-dihalides.
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