Question

In the following benzyl/allyl system
$\underset{\text{(R is alkyl group)}}{R - CH = CH_2}$ or

decreasing order of inductive effect is

• A. $\left( CH _{3}\right)_{3} C ->\left( CH _{3}\right)_{2} CH -> CH _{3} CH _{2}-$
• B. $CH _{3} CH _{2}->\left( CH _{3}\right)_{2} CH ->\left( CH _{3}\right)_{3} C -$
• C. $\left( CH _{3}\right)_{2} CH -> CH _{3} CH _{2}->\left( CH _{3}\right)_{3} C - $
• D. $ (CH_3)_2C — > CH_3CH_2 — > (CH_3)_3CH —$

Answer 1

Answer: (A)

Both where R is attached to vinylic ($\approx$ arylic) system Positive inductive effect occurs in the following order: