AP EAMCET · Chemistry · p Block Elements (Group 13 & 14)

Identify the correct statements about the anomalous behaviour of Boron I. Boron trihalides can form dimeric structures. II. Boron shows $+ 1$ as stable oxidation state III. Maximum covalency of Boron is four. IV. Boron does not form ${BF}_{6}^{6 -}$ ion.

A $I, II$ only
B $II, III$ only
C $III, IV$ only
D $I, IV$ only

Verified Solution

Answer & Solution

Correct Answer

(C) $III, IV$ only

Step-by-step Solution

Detailed explanation

Due to its smaller size and unavailability of d-electrons boron is found to exhibit properties which are in contrast to the other elements of the boron family. I. Boron trihalides done not form dimeric structures instead they complete octet with back bonding. Other member of…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Identify the correct statements about the anomalous behaviour of Boron I. Boron trihalides can form dimeric structures. II. Boron shows +1 as stable oxidation state III. Maximum covalency of Boron is four. IV. Boron does not form BF66- ion.

Step-by-step Solution

Identify the correct statements about the anomalous behaviour of Boron I. Boron trihalides can form dimeric structures. II. Boron shows $+ 1$ as stable oxidation state III. Maximum covalency of Boron is four. IV. Boron does not form ${BF}_{6}^{6 -}$ ion.