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Number of molecules from the following which are exceptions to octet rule is ______ $$CO_2$$, $$NO_2$$, $$H_2SO_4$$, $$BF_3$$, $$CH_4$$, $$SiF_4$$, $$ClO_2$$, $$PCl_5$$, $$BeF_2$$, $$C_2H_6$$, $$CHCl_3$$, $$CBr_4$$
Correct Answer: 6
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