Reaction of 3 moles of BCl3 with 3 moles of NH4Cl at 1400Cproduces compound P(containing boron). Futher, P reacts NaBH4 to give colourless liquid Q as one of the product. If heated with water, Q hydrolyses slowly, Produces three compound R,S and T. Sum of the atomicity of R, S and T molecule is:

Question

Reaction of  3 moles of  BCl3    with 3 moles of  NH4Cl  at   1400Cproduces compound P(containing boron). Futher, P  reacts  NaBH4 to give colourless liquid Q as one of the product. If heated with water, Q hydrolyses slowly, Produces three compound R,S and T. Sum of the atomicity of R, S and T molecule is:

Accepted Answer

Boron Trichloride Reduction Reaction Sequence

Step 1: Initial Reaction

BCl₃ + NH₄Cl → B₃N₃Cl₃H₃

Reactants: Boron trichloride (BCl₃) and ammonium chloride (NH₄Cl)

Product: B₃N₃Cl₃H₃ (Trichloroborazine - a boron-nitrogen heterocycle)

Step 2: Reduction with Sodium Borohydride

NaBH₄ B₃N₃Cl₃H₃ → B₃N₃H₆

Reagent: Sodium borohydride (NaBH₄) - a reducing agent

Product: B₃N₃H₆ (Borazine - also known as "inorganic benzene")

This step replaces the chlorine atoms with hydrogen atoms through reduction.

Step 3: Hydrolysis

H₂O B₃N₃H₆ → NH₃ + H₃BO₃ + H₂

Reagent: Water (H₂O)

Products:

NH₃ - Ammonia
H₃BO₃ - Boric acid
H₂ - Hydrogen gas

This step involves the hydrolysis (reaction with water) of borazine, breaking down the B-N ring structure.

Overall Reaction Summary

This three-step reaction sequence demonstrates the synthesis and subsequent decomposition of boron-nitrogen compounds:

Formation: BCl₃ reacts with NH₄Cl to form trichloroborazine (B₃N₃Cl₃H₃)
Reduction: NaBH₄ reduces trichloroborazine to borazine (B₃N₃H₆), replacing Cl with H
Hydrolysis: Water breaks down borazine into ammonia, boric acid, and hydrogen gas

Note: Borazine (B₃N₃H₆) is structurally similar to benzene (C₆H₆) and is sometimes called "inorganic benzene" due to its analogous cyclic structure with alternating boron and nitrogen atoms.

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Detailed Solution

Boron Trichloride Reduction Reaction Sequence

Overall Reaction Summary

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