Kossel - Lewis approach to chemical bonding

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Question

Number of molecules that do not follow octet rule among the following is :
$CO, {PCl}_{5}, {PCl}_{3}, {AlCl}_{3}, {SF}_{6}, {BF}_{3}, {NH}_{3}$

Moderate

Solution

${AICl}_{3}, {BF}_{3} - Electron deficient.$
${PCl}_{5}, {SF}_{6} - More than 8 electrons.$

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