Home › Previous year questions › GATE 2023 CY › Question 19GATE 2023 CY – Question 19 Inorganic Chemistry · Main Group Elements: Shapes and structures of molecules using VSEPR postulates, Hydrides, halides, oxides, oxoacids, nitrides, sulfides - shapes and reactivity. Structure and bonding of boranes, carboranes, silicones, silicates, boron nitride, borazine and phosphazenes: electron counting in polyhedral boranes, isolobal analogy. Allotropes of carbon, phosphorus and sulfur. Industrial synthesis of compounds of main group elements such as NH3, H2SO4 and HNO3. Chemistry of noble gases and interhalogen compounds. Acid-base concepts and principles (Lewis, Brønsted, HSAB and acid-base catalysis). · 1 mark · Multiple choice
The reaction of $Ph_3PCl_2$ with $PhNH_2$ primarily produces ______.
$Ph_3P=NPh$ $PhP=NPh$ $PhCl_2P=NPh$ $Ph_2ClP=NPh$ Practise this question in The GATE Grind →
Show answer and explanation Correct answer: (A) $Ph_3P=NPh$
Explanation The amine substitutes at phosphorus and loss of two equivalents of HCl gives an iminophosphorane. The three phenyl substituents onphosphorus remain intact, so the product is **Ph3P=NPh, A**. The other options would require cleavage of P–phenyl bonds rather than substitution of the chlorides.