9701 MCQ Solution 54

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Question 54: [Physical > Bonding]
Aluminium chloride catalyses certain reactions by forming carbocations (carbonium ions) with choloralkanes as shown.
Which property makes this reaction possible?
A AlCl3 is a covalent molecule.
B AlCl3 exists as the dimer Al2Cl6 in the vapour.
C The aluminum atom in AlCl3 has an incomplete octet of electrons.
D The chlorine atom in RCl has a vacant p orbital.
Reference: Past Exam Paper -June 2003 Paper 1 Q14


Solution 54:
Answer: C.

The aluminium atom has an incomplete octet of electrons therefore it will form co-ordinate bonds ti have a complete octet of electrons therefore this reaction is possible.

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