1
MCQ (Single Correct Answer)

AIPMT 2008

Base strength of

is in the order of
A
(i) > (iii) > (ii)
B
(i) > (ii) > (iii)
C
(ii) > (i) > (iii)
D
(iii) > (ii) > (i)

Explanation

Weaker the acid, strongest is its conjugate base. Among alkane, alkene and alkyne, alkyne are most acidic and alkanes are least acidic, so the order of base strength is :

(i) > (ii) > (iii)
2
MCQ (Single Correct Answer)

AIPMT 2007

For (i) I$$-$$, (ii) Cl$$-$$, (iii) Br$$-$$, the increasing order of nucleophilicity would be
A
Cl$$-$$ < Br$$-$$ < I$$-$$
B
I$$-$$ < Cl$$-$$ < Br$$-$$
C
Br$$-$$ < Cl$$-$$ < I$$-$$
D
I$$-$$ < Br$$-$$ < Cl$$-$$

Explanation

Nucleophilicity increases down the periodic table :

I > Br > Cl > F
3
MCQ (Single Correct Answer)

AIPMT 2007

The order of decreasing reactivity towards an electrophilic reagent, for the following would be
(i) benzene
(ii) toluene
(iii) chlorobenzene
(iv) phenol
A
(ii) > (iv) > (i) > (iii)
B
(iv) > (iii) > (ii) > (i)
C
(iv) > (ii) > (i) > (iii)
D
(i) > (ii) > (iii) > (iv)

Explanation

Benzene having any activating group, i.e., OH, R etc. undergoes electrophilic substitution very easily as compared to benzene itself. Thus, toluene (C6H5CH3) and phenol (C6H5OH) undergo electrophilic substitution very readily than benzene. Chlorine with +E and +M effect deactivates the ring due to strong –I effect. So, it is difficult to carry out the substitution in chlorobenzene than in benzene, so correct order is

(iv) > (ii) > (i) > (iii)
4
MCQ (Single Correct Answer)

AIPMT 2006

The IUPAC name of



is
A
1-chloro-1-oxo-2, 3-dimethylpentane
B
2-ethyl-3-methylbutanoyl chloride
C
2, 3-dimethylpentanoyl chloride
D
3, 4-dimethylpentanoyl chloride.

Explanation

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