AIEEE 2008 | Chemical Bonding & Molecular Structure Question 199 | Chemistry

The bond dissociation energy of B - F in BF₃ is 646 kJ mol^-1 whereas that of C - F in CF₄ is 515 kj mol^-1. The correct reason for higher B - F bond dissociation energy as compared to that of C - F is

stronger $$\sigma$$ bond between B and F in BF₃ as compared to that between C and F in CF₄

significant $$p\pi - p\pi$$ interaction between B and F in BF₃ whereas there is no possibility of such interaction between C and F in CF₄

lower degree of $$p\pi - p\pi$$ interaction between B and F in BF₃ than that between C and F in CF₄

smaller size of B - atom as compared to that of C- atom.

AIEEE 2008

MCQ (Single Correct Answer)

-1

Which of the following pair of species have the same bond order?

CN^- and NO⁺

CN^- and CN⁺

$$O_2^-$$ and CN^-

NO⁺ and CN⁺

AIEEE 2007

MCQ (Single Correct Answer)

-1

Which of the following species exhibits the diamagnetic behaviour?

$$O_2^{2−}$$

$$O_2^+$$

O₂

AIEEE 2007

MCQ (Single Correct Answer)

-1

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizinig order of the polarizing power of the cationic species, K⁺, Ca²⁺, Mg²⁺, Be²⁺?

Mg²⁺ < Be²⁺ < K⁺ < Ca²⁺

K⁺ < Ca²⁺ < Mg²⁺ < Be²⁺

Be²⁺ < K⁺ < Ca²⁺ < Mg²⁺

Ca²⁺ < Mg²⁺ < Be²⁺ < K⁺

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