Identify the correct statement for \(\mathrm{B_2H_6}\) from those given below :
(A) In \(\mathrm{B_2H_6}\), all B-H bonds are equivalent.
(B) In \(\mathrm{B_2H_6}\), there are four 3-centre-2-electron bonds.
(C) \(\mathrm{B_2H_6}\) is a Lewis acid.
(D) \(\mathrm{B_2H_6}\) can be synthesized from both \(\mathrm{BF_3}\) and \(\mathrm{NaBH_4}\).
(E) \(\mathrm{B_2H_6}\) is a planar molecule.
Choose the most appropriate answer from the options given below :
(A) In \(\mathrm{B_2H_6}\), all B-H bonds are equivalent.
(B) In \(\mathrm{B_2H_6}\), there are four 3-centre-2-electron bonds.
(C) \(\mathrm{B_2H_6}\) is a Lewis acid.
(D) \(\mathrm{B_2H_6}\) can be synthesized from both \(\mathrm{BF_3}\) and \(\mathrm{NaBH_4}\).
(E) \(\mathrm{B_2H_6}\) is a planar molecule.
Choose the most appropriate answer from the options given below :
Show Hint
- (A) and (E) only
- (B), (C) and (E) only
- (C) and (D) only
- (C) and (E) only
The Correct Option is C
Solution and Explanation
(A) False: terminal B-H and bridging B-H bonds differ in length and nature.
(B) False: there are only two 3-centre-2-electron bonds, not four.
(C) True: B has an incomplete octet (electron deficient), so \(\mathrm{B_2H_6}\) accepts electron pairs, e.g. \(\mathrm{B_2H_6 + 2NH_3 \rightarrow [BH_2(NH_3)_2]^+[BH_4]^-}\).
(D) True: \(\mathrm{4BF_3 + 3NaBH_4 \rightarrow 2B_2H_6 + 3NaBF_4}\) (and also from \(\mathrm{BF_3}\) with \(\mathrm{LiAlH_4}\)).
(E) False: only the two B atoms and four terminal H lie in one plane; the two bridging H lie above and below this plane.
Correct statements: (C) and (D).
Answer: (3) (C) and (D) only
Top JEE Main Chemistry Questions
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- At equilibrium the concentrations of and in a sealed vessel at . What will be for the reaction
- Find out the major products from the following reactions
Cobalt chloride when dissolved in water forms pink colored complex $X$ which has octahedral geometry. This solution on treating with cone $HCl$ forms deep blue complex, $\underline{Y}$ which has a $\underline{Z}$ geometry $X, Y$ and $Z$, respectively, are
- The correct order of atomic radii is:
Top JEE Main p -Block Elements Questions
- $\textbf{Reduction potential of ions are given below:}$
\[ \begin{array}{ccc} \text{ClO}_4^- & \text{IO}_4^- & \text{BrO}_4^- \\ E^\circ = 1.19 \, \text{V} & E^\circ = 1.65 \, \text{V} & E^\circ = 1.74 \, \text{V} \\ \end{array} \]
The correct order of their oxidising power is: - $\textbf{Choose the correct statements about the hydrides of group 15 elements.}$
A. The stability of the hydrides decreases in the order \(\text{NH}_3 > \text{PH}_3 > \text{AsH}_3 > \text{SbH}_3 > \text{BiH}_3\)
B. The reducing ability of the hydrides increases in the order \(\text{NH}_3 < \text{PH}_3 < \text{AsH}_3 < \text{SbH}_3 < \text{BiH}_3\)
C. Among the hydrides, \(\text{NH}_3\) is a strong reducing agent while \(\text{BiH}_3\) is a mild reducing agent.
D. The basicity of the hydrides increases in the order \(\text{NH}_3 < \text{PH}_3 < \text{AsH}_3 < \text{SbH}_3 < \text{BiH}_3\)
Choose the most appropriate from the option given below: The number of oxygen atoms present in chemical formula of fuming sulphuric acid is _______.
- Identify the correct statements about p-block elements and their compounds.
(A) Non metals have higher electronegativity than metals.
(B) Non metals have lower ionisation enthalpy than metals.
(C) Compounds formed between highly reactive nonmetals and highly reactive metals are generally ionic.
(D) The non-metal oxides are generally basic in nature.
(E) The metal oxides are generally acidic or neutral in nature. Given below are two statements:
Statement I: Nitrogen forms oxides with +1 to +5 oxidation states due to the formation of $\mathrm{p} \pi-\mathrm{p} \pi$ bond with oxygen.
Statement II: Nitrogen does not form halides with +5 oxidation state due to the absence of d-orbital in it.
In the light of the above statements, choose the correct answer from the options given below:
Top JEE Main Questions
- Two masses $m$ and $\frac{m}{2}$ are connected at the two ends of a massless rigid rod of length $l$. The rod is suspended by a thin wire of torsional constant $k$ at the centre of mass of the rod-mass system(see figure). Because of torsional constant $k$, the restoring torque is $\tau =k\theta$ for angular displacement $\theta$. If the rod is rota ted by $\theta_0$ and released, the tension in it when it passes through its mean position will be:
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- The value of is
- The number of terms of an is even. The sum of the odd terms is and of the even terms is . The last term exceeds the first by . Then the number of terms in the series is ______.
A black body is at a temperature of 2880 K. The energy of radiation emitted by this body with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm is U2 and between 1499 nm and 1500 nm is U3. The Wien's constant, b = 2.88×106 nm-K. Then,