MCQ
Which of the following is an electron deficient molecule?
- A$LiH$
- ✓$B_2H_6$
- C$LiBH_4$
- D$B_3N_3H_6$
✓
Answer
Correct option: B.
$B_2H_6$
b
$\mathrm{B}_{2} \mathrm{H}_{6}$ is electron deficient molecule because boron atom has three half-filled orbitals in an excited state.
$\mathrm{B}_{2} \mathrm{H}_{6}$ is electron deficient molecule because boron atom has three half-filled orbitals in an excited state.
The structure of $\mathrm{B}_{2} \mathrm{H}_{6}$ is represented as follows:
In it, two electrons of $\mathrm{B}$ -H bond are involved in the formation of three centre bond, these bonds are represented by a dotted line.
Hence, option A is correct.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
$5\,mole$ of $A$, $6\, moles$ of $B$ and excess amount of $C$ are mixed to produce a final product $D$, according to the reaction
$A + 2B \to I$
$I + C \to B + D$
What is the maximum moles of $D$ can be produced assuming that the products formed can also be reused in the reactions ? .............. $\mathrm{moles}$
→$A + 2B \to I$
$I + C \to B + D$
What is the maximum moles of $D$ can be produced assuming that the products formed can also be reused in the reactions ? .............. $\mathrm{moles}$
Number of molecules/ions from the following in which the central atom is involved in $\mathrm{sp}^3$ hybridization is. . . . . . . . . .$\mathrm{NO}_3^{-}, \mathrm{BCl}_3, \mathrm{ClO}_2^{-}, \mathrm{ClO}_3$
→The solubility of sparingly soluble salt $A_3B_2$ (Molar mass $=\,'M'\,\,g/mol$ ) in water is $x\,\,g/L.$ The ratio of solubility product of salt to the molar concentration of $B^{-3}$ ion is
→Which among the following shows maximum oxidation state?
Given that $K_w$ for water is $10^{-13}\ M^2$ at $62\,^oC$ , compute the sum of $pOH$ and $pH$ for a neutral aqueous solution at $62\,^oC$
→$9.0 \,gm$ of $H_2O$ is vaporised at $100\,^oC$ and $1\,atm$ pressure. If the latent heat of vaporisation of water is $xJ / \, gm$, then $DS$ is given by :-
→For the estimation of nitrogen, $1.4\, g$ of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in $60\, mL$ of $\frac{M}{10}$ sulphuric acid. The unreacted acid required $20\, mL$ of $\frac{M}{10}$ sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is .....$\%$
→Which of the following orbitals has zero probability of finding the electron in $YZ$ plane
→When the excited electron of a $H$ atom from $n =5$ drops to the ground state, the maximum number of emission lines observed are$.......$
→The $IUPAC$ name of is
→