The correct order with respect to –I effect of the substituents is:
(R = alkyl)

1. -NH2 > - OR < - F
2. -NR2 < -OR < - F
3. -NH2 > - OR > - F
4. -NR2 > - OR > - F

Subtopic:  Electron Displacement Effects |
From NCERT
NEET - 2018
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The most stable carbocation among the following is:

1. 2.
3. 4.
Subtopic:  Electron Displacement Effects |
 51%
From NCERT
NEET - 2018
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In pyrrole 
 
the electron density is maximum on:

1.  2 and 3

2.  3 and 4

3.  2 and 4

4.  2 and 5

Subtopic:  Electron Displacement Effects |
 78%
NEET - 2016
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