Arrangement of (CH3)3C−,(CH3)2CH−,CH3−CH2−when attached to benzyl or an unsaturated group in increasing order of inductive effect is:
A
(CH3)3C−<(CH3)2CH−<CH3−CH2
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B
CH3−CH2−<(CH3)2CH−<(CH3)3C−
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C
(CH3)2CH−<(CH3)3C−<CH3−CH2
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D
(CH3)3C−<CH3−CH2<(CH3)2CH−
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Solution
The correct option is BCH3−CH2−<(CH3)2CH−<(CH3)3C− −CH3 group has +I effect, as number of −CH3 froup increases, the inductive effect increases. this effect diminishes after 3rd carbon. Therefore the correct order is CH3−CH2−<(CH3)2CH−<(CH3)3C−