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Choose the INCORRECT statements from the...

Choose the INCORRECT statements from the following -

A

Bond angles are not affected in `BF_(3)` due to back bonding

B

Bond angles are affected in `PF_(3)` due to back bonding

C

Bond angles are not affected in `B(O Me)_(3)` due to back bonding

D

none of these

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question of identifying the incorrect statements regarding bond angles and back bonding, we will analyze each statement step by step. ### Step-by-Step Solution: 1. **Statement 1: Bond angles are not affected in BF3 due to back bonding.** - **Analysis:** - BF3 has a trigonal planar geometry with bond angles of 120 degrees. - In BF3, there is no lone pair on the boron atom, and the presence of back bonding does not alter the bond angles significantly. - Therefore, this statement is **correct**. 2. **Statement 2: Bond angles are affected in PF3 due to back bonding.** - **Analysis:** - PF3 has a trigonal pyramidal shape due to the presence of a lone pair on phosphorus. - The lone pair causes repulsion, which reduces the bond angles from the ideal tetrahedral angle of 109.5 degrees. - Thus, this statement is also **correct**. 3. **Statement 3: Bond angles are not affected in BOMe3 due to back bonding.** - **Analysis:** - BOMe3 (Boron trimethyl ether) has a structure where boron is bonded to three OMe groups. - The presence of partial double bond character between boron and oxygen due to resonance leads to bond angle changes. - The bond angles in BOMe3 are affected and are larger than the ideal tetrahedral angle due to repulsion between the double and single bonds. - Therefore, this statement is **incorrect**. 4. **Statement 4: None of these.** - **Analysis:** - Since we have identified Statement 3 as incorrect, this statement is also **incorrect** because it claims that none of the previous statements are incorrect. ### Conclusion: The incorrect statement among the options provided is **Statement 3**: "Bond angles are not affected in BOMe3 due to back bonding." ### Final Answer: The answer to the question is **Statement 3**. ---
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