In which of the following compounds, +I group is present?
A
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B
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C
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D
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Solution
The correct option is D Permanent shift in electron density from the substituent towards the carbon chain is called +I effect. +I group leads to development of ẟ- on C atom sharing a bond with the substituent. In option a, b and c the groups are -I group. So the correct answer is option(d)