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1

AIPMT 2000

MCQ (Single Correct Answer)
Increasing order of electrophilic substitution for following compounds
A
IV < I < II < III
B
III < II < I < IV
C
I < IV < III < II
D
II < III < I < IV

Explanation

Among —CH3, —OCH3 and CF3,

CH3 and —OCH3 are electron donating groups. Hence, they activate the benzene ring. In these the order of activation is —OCH3 $$>$$ —CH3 while —CF3 group deactivates the benzene nucleus. So, it shows lower rate of electrophilic substitution on benzene ring. Thus, order of electrophilic substitution is :
2

AIPMT 2000

MCQ (Single Correct Answer)
In Friedel-Crafts reaction , toluene can be prepared by
A
C6H6 + CH3Cl
B
C6H5Cl + CH4
C
C6H6 + CH2Cl2
D
C6H6 + CH3COCl

Explanation

3

AIPMT 2000

MCQ (Single Correct Answer)
Which is maximum stable?
A
1-Butene
B
cis-2-Butene
C
trans-2-Butene
D
All have same stability.

Explanation



This is most stable as the repulsion between two methyl groups is least.
4

AIPMT 2000

MCQ (Single Correct Answer)
Which reagent converts propene to 1-propanol ?
A
H2O, H2SO4
B
B2H6, H2O2, OH$$-$$
C
Hg(OAc)2, NaBH4/H2O
D
Aq. KOH

Explanation

Propene adds to diborane (B2H6) giving an addition product. The addition compound on oxidation gives 1-propanol. Here addition of water takes place according to anti-Markownikoff’s rule.

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