Teaching Railway Teacher PRT 2025 Mock Test Series General Science Chemistry Chemical Bond and Molecular Structure

বেনজিনে যথাক্রমে σ এবং π বন্ধনের সংখ্যা হল: 

1
12 এবং 3
2
3 এবং 3
3
6 এবং 3
4
9 এবং 3
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