question_answer

In a regular octahedral molecule, \[M{{X}_{6}}\] the number of \[X-M-X\] bonds at 180° is:    [AIPMT (S) 2004]

A)  three               

B)       two                 

C)  six      

D)  four

Correct Answer: A

Solution :

In octahedral structure \[M{{X}_{6}}^{,}\] the six hybrid orbitals   \[(s{{p}^{3}}{{d}^{2}})\]  are directed towards the corners of a regular octahedral with an angle of \[90{}^\circ \]. According to following structure of \[M{{X}_{6}},\] the number of \[XMX\] bonds at \[180{}^\circ \] must be three.