The tendency of \(BF_3, BCI_3 \, and \, BBr_3\) behave as Lewis acid decreases in the sequence
\(BCI_3 > BF_3 > BBr_3\)
\(BBr_3 > BCI_3 > BF_3\)
\(BBr_3 > BF_3 > BCI_3\)
\(BF_3 > BCI_3 > BBr_3\)
The Correct Option is B
Solution and Explanation
As the size of halogen atom increases, the acidic strength of boron halides increases. Thus, \(BF_3\) is the weakest Lewis acid. This is because of the p\(\pi - p\pi\) back bonding between the fully filled unutilised 2p-orbitals of F and vacant 2p-orbitals of boron which makes \(BF_3\) less electron deficient. Such back donation is not possible in case of \(BCI_3 \, or \, BBr_3\) due to larger energy difference between their orbitals. Thus, these are more electron deficient. Since on moving down the group the energy difference increases, the Lewis acid character also increases. Thus, the tendency to behave as Lewis acid follows the order
\(BBr_3 > BCI_3 > BF_3\)
Top Questions on Acids and Bases
- What is the pH of a 0.01 M hydrochloric acid (HCl) solution?
- MHT CET - 2024
- Chemistry
- Acids and Bases
- The limiting molar conductivities of \( HCl \), \( CH_3COONa \), and \( NaCl \) are respectively 425, 90, and 125 mho cm\(^2\) mol\(^{-1}\) at 25°C. The molar conductivity of 0.1M \( CH_3COOH \) solution is 7.8 mho cm\(^2\) mol\(^{-1}\) at the same temperature. The degree of dissociation of 0.1M acetic acid solution at the same temperature is:
- VITEEE - 2023
- Chemistry
- Acids and Bases
Choose the correct option for the following reactions.
- VITEEE - 2023
- Chemistry
- Acids and Bases
- Which of the following exhibits Frenkel defects?
- VITEEE - 2023
- Chemistry
- Acids and Bases
- On passing current through two cells, connected in series, containing solutions of \( {AgNO}_3 \) and \( {CuSO}_4 \), 0.18 g of Ag is deposited. The amount of Cu deposited is:
- VITEEE - 2023
- Chemistry
- Acids and Bases
Questions Asked in NEET exam
- Given below are two statements:
Statement I: Both [Co(NH3)6]3+ and [CoF6]3- complexes are octahedral but differ in their magnetic behaviour.
Statement II: [Co(NH3)6]3+ is diamagnetic whereas [CoF6]3- is paramagnetic.
In the light of the above statements, choose the correct answer from the options given below:- NEET (UG) - 2024
- Electronic configuration of atoms and ions
- \(^{290}_{82}X\stackrel{\alpha}{\rightarrow}Y\stackrel{e^+}{\rightarrow}Z\stackrel{\beta^-}{\rightarrow}P\stackrel{e^-}{\rightarrow}Q\)
In the nuclear emission stated above, the mass number and atomic number of the product Q respectively, are :- NEET (UG) - 2024
- Nuclear physics
- Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The potential (V) at any axial point, at 2 m distance(r) from the centre of the dipole of dipole moment vector \(\vec{P}\) of magnitude, 4 × 10-6 C m, is ± 9 × 103 V.
(Take \(\frac{1}{4\pi\epsilon_0}=9\times10^9\) SI units)
Reason R : \(V=±\frac{2P}{4\pi \epsilon_0r^2}\), where r is the distance of any axial point, situated at 2 m from the centre of the dipole.
In the light of the above statements, choose the correct answer from the options given below :- NEET (UG) - 2024
- Magnetic Field
- Choose the correct circuit which can achieve the bridge balance.
- NEET (UG) - 2024
- Digital Electronics and Logic Gates
- In a Vernier caliper, \(N+1\) divisions of vernier scale coincide with \(N\) divisions of main scale. If 1 MSD represents 0.1 mm, the vernier constant (in cm) is:
- NEET (UG) - 2024
- Units, Dimensions and Measurements
Concepts Used:
Acids and Bases
Acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance. Base is an ion or molecule capable of accepting a hydrogen ion from acid.
Physical Properties of Acids and Bases
| Physical Properties | ACIDS | BASES |
| Taste | Sour | Bitter |
| Colour on Litmus paper | Turns blue litmus red | Turns red litmus blue |
| Ions produced on dissociation | H+ | OH- |
| pH | <7 (less than 7) | >7 (more than 7) |
| Strong acids | HCl, HNO3, H2SO4 | NaOH, KOH |
| Weak Acids | CH3COOH, H3PO4, H2CO3 | NH4OH |
Chemical Properties of Acids and Bases
| Type of Reaction | Acid | Bases |
| Reaction with Metals | Acid + Metal → Salt + Hydrogen gas (H2) E.g., Zn(s)+ dil. H2SO4 → ZnSO4 (Zinc Sulphate) + H2 | Base + Metal → Salt + Hydrogen gas (H2) E.g., 2NaOH +Zn → Na2ZnO2 (Sodium zincate) + H2 |
| Reaction with hydrogen carbonates (bicarbonate) and carbonates | Metal carbonate/Metal hydrogen carbonate + Acid → Salt + Carbon dioxide + Water E.g., HCl+NaOH → NaCl+ H2O 2. Na2CO3+ 2 HCl(aq) →2NaCl(aq)+ H2O(l) + CO2(g) 3. Na2CO3+ 2H2SO4(aq) →2Na2SO4(aq)+ H2O(l) + CO2(g) 4. NaHCO3+ HCl → NaCl+ H2O+ CO2 | Base+ Carbonate/ bicarbonate → No reaction |
| Neutralisation Reaction | Base + Acid → Salt + Water E.g., NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l) | Base + Acid → Salt + Water E.g., CaO+ HCl (l) → CaCl2 (aq)+ H2O (l) |
| Reaction with Oxides | Metal oxide + Acid → Salt + Water E.g., CaO+ HCl (l) → CaCl2 (aq)+ H2O (l) | Non- Metallic oxide + Base → Salt + Water E.g., Ca(OH)2+ CO2 → CaCO3+ H2O |
| Dissolution in Water | Acid gives H+ ions in water. E.g., HCl → H+ + Cl- HCl + H2O → H3O+ + Cl– | Base gives OH- ions in water. |
Read more on Acids, Bases and Salts