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Question

Arrange the following in increasing order of +I effect :
1Alkyl Group, 2Alkyl Group, 3Alkyl Groupand Methyl Group

A
1Alkyl Group <2Alkyl Group <3Alkyl Group <Methyl Group
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B
Methyl Group<1Alkyl Group <2Alkyl Group <3Alkyl Group
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C
1Alkyl Group <3Alkyl Group <2Alkyl Group <Methyl Group
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D
Methyl Group<3Alkyl Group <1Alkyl Group <1Alkyl Group
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Solution

The correct option is B Methyl Group<1Alkyl Group <2Alkyl Group <3Alkyl Group
Alkyl groups are electron donating groups
More the number of alkyl groups attached, higher the strength of +I effect.
In other words, as the degree of ‘C’ increases, the strength of +I effect increases.
So, the order of electron donating tendency or +I effect order will be
Methyl Group<1Alkyl Group <2Alkyl Group <3Alkyl Group

or

CH3<CH2CH3<CH(CH3)2<C(CH3)3

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