1
MCQ (Single Correct Answer)

AIPMT 2010 Prelims

The correct order of increasing bond angles in the following species is
A
Cl2O < ClO2 < ClO$$_2^ - $$
B
ClO2 < Cl2O < ClO$$_2^ - $$
C
Cl2O < ClO$$_2^ - $$ < ClO2
D
ClO$$_2^ - $$ < Cl2O < ClO2

Explanation

The correct order of increasing bond angles is

ClO$$_2^ - $$ < Cl2O < ClO2
2
MCQ (Single Correct Answer)

AIPMT 2010 Prelims

The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence
A
BCl3 > BF3 > BBr3
B
BBr3 > BCl3 > BF3
C
BBr3 > BF3 > BCl3
D
BF3 > BCl3 > BBr3

Explanation

In BF3, p-p overlap between B and F is maximum due to identical size and energy of p-orbitals, so electron deficiency in boron of BF3 is neutralized partially to the maximum extent by back donation. Also, the tendency to back donate decreases from F to I. So the order will be:

BBr3 > BCl3 > BF3
3
MCQ (Single Correct Answer)

AIPMT 2010 Prelims

Which one of the following molecular hydrides acts as a Lewis acid?
A
NH3
B
H2O
C
B2H6
D
CH4

Explanation

Among the given molecules, only diborane(B2H6) is electron deficient i.e., it does not complete octet.

Thus, it acts as a Lewis acid.

NH3 and H2O being electron rich species behave as Lewis base.
4
MCQ (Single Correct Answer)

AIPMT 2009

Among the following which is the strongest oxidising agent?
A
Br2
B
I2
C
Cl2
D
F2

Explanation

Standard reduction potential of halogens are positive and decrease from fluorine to iodine. So, F2 is the strongest oxidizing agent.

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