NEETChemistryp Block Elements (Group 13 & 14)
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A : Boron is unable to form BF 6 3 - Reason R : Size of B is very small. In the light of the above statements, choose the correct answer from the options given below
Options
- ABoth A and R are true and R is the correct explanation of A
- BBoth A and R are true but R is not the correct explanation of A
- CA is true but R is false
- DA is false but R is true
Correct answer
B. Both A and R are true but R is not the correct explanation of A
Step-by-step solution
Due to non-availability of d orbitals, boron is unable to expand its octet. Therefore, the maximum covalence of boron cannot exceed 4 . Boron is the first element from top in group 13 and the atomic size increases down the group. Therefore, boron is smallest in size. Assertion A : True Reason R : True but not correct explanation.