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The molecule , which are electron defici...

The molecule , which are electron deficient having tendency to form back bonding, in which transfer of lone pair of electron from filled orbital of an atom to the vacant orbital of the adjacent atom. While some electron deficient species which are not capable to form back bonding, then driving forces occurs for dimerisation/polymerisation to achieve octet temporily or permanently by the monomeric species.
Which of the following readily gets combined with lewis base `(NH_(3),CH_(3)NH_(2),C_(5)H_(5)N "etc")`

A

`C_(2)H_(6)`

B

`I_(2)Cl_(6)`

C

`B_(2)H_(6)`

D

`(BeCl_(2))_(n)`

Text Solution

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The correct Answer is:
To solve the question regarding which molecule readily combines with Lewis bases such as NH₃, CH₃NH₂, and C₅H₅N, we need to analyze the electron deficiency and bonding characteristics of the given compounds. ### Step-by-Step Solution: 1. **Identify the Compounds**: The question presents several compounds, and we need to evaluate their ability to act as Lewis acids. The compounds in question are CH₃CH₃, I₂Cl₂, and B₂H₆. 2. **Evaluate CH₃CH₃ (Ethane)**: - Ethane (CH₃CH₃) is a saturated hydrocarbon with all carbon atoms having a complete octet. - Since it has no vacant orbitals, it cannot accept electron pairs from Lewis bases. - **Conclusion**: CH₃CH₃ does not readily combine with Lewis bases. 3. **Evaluate I₂Cl₂ (Dichlorine Diiodide)**: - I₂Cl₂ can be seen as a dimer formed from ICl₃. The iodine atoms in I₂Cl₂ have completed their octets. - There are no vacant orbitals available for interaction with Lewis bases. - **Conclusion**: I₂Cl₂ does not readily combine with Lewis bases. 4. **Evaluate B₂H₆ (Diborane)**: - Diborane (B₂H₆) is known to be electron deficient. It can be viewed as a dimer of BH₃, which has vacant orbitals due to the electron deficiency of boron. - The vacant orbitals on boron allow it to accept lone pairs from Lewis bases like NH₃, CH₃NH₂, and C₅H₅N. - **Conclusion**: B₂H₆ readily combines with Lewis bases. 5. **Final Answer**: Based on the evaluations, the compound that readily gets combined with Lewis bases is **B₂H₆**.
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