A compound X of boron reacts with NH3 on heating to give another compound Y which is called 'inorganic benzene'. The compound X can be prepared by treating BF3 with lithium aluminium hydride. The compounds X and Y are represented respectively by the formulas:

Which statement(s) regarding the structure of P4O10 is/are correct? (A) It contains a cage structure with bridging and terminal oxygen atoms. (B) Each phosphorus atom is coordinated tetrahedrally. (C) There are four terminal P=O bonds. (D) All P–O–P bridge bond angles are 180°.

Which of the following gases is reddish-brown in colour?