Increasing order of electron withdrawing power of following functional groups is:
a. -CN
b. -COOH
c. $-\mathrm{NO}_2$
d. -1
Select the correct option:
A
c $<$ b $<$ d $<$ a
B
c $<$ a $<$ b $<$ d
C
d $<$ b $<$ a $<$ c
D
a $<$ b $<$ c $<$ d
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
Solution
Increasing order of electron withdrawing power of functional groups are :
$$
\begin{aligned}
& -\mathrm{NR}_3^{+}>-\mathrm{SR}_2^{+}>-\mathrm{NH}_3^{+}>-\mathrm{NO}_2>-\mathrm{SO}_2 \mathrm{R}>-\mathrm{CN}>-\mathrm{CHO}>-\mathrm{COOH} \\
& >-\mathrm{F}>-\mathrm{Cl}>-\mathrm{Br}>-\mathrm{I}>-\mathrm{OR}>-\mathrm{OH}>-\mathrm{C}_6 \mathrm{H}_5
\end{aligned}
$$
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