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 |
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The most stable carbocation among the following is:

1. 2.
3. 4.
Subtopic:  Electron Displacement Effects |
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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 |
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