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When an inorganic compound \( X \) having \( 3 \mathrm{C}-2 e \) as well as \( 2 \mathrm{C}-2 e \) bonds react with \( \mathrm{NH}_{3} \) gas at a certain temperature, gives a compound \( Y \), isostructural with benzene. Compound \( X \) with
\( \mathrm{P} \) ammonia at a high temperature produces a substance \( Z \), then :
(a) \( \mathrm{X} \) is \( \mathrm{BH}_{3}, Y \) is \( \mathrm{B}_{2} \mathrm{~N}_{2} \mathrm{H}_{3}, Z \) is inorganic benzene.
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(b) \( X \) is \( \mathrm{B}_{2} \mathrm{H}_{6}, Y \) is \( \mathrm{B}_{3} \mathrm{~N}_{3} \mathrm{H}_{6}, Z \) is boron nitride.
(c) \( X \) is borax, \( Y \) is \( \mathrm{B}_{2} \mathrm{O}_{3}, Z \) is inorganic benzene.
(d) Reactions insufficient to predict.
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