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Is there any rule about which hydrogen in alkane will be replaced by a halogen atom during substitution reaction as per below? Thank you in advanced!!!!!

Thank You so much!

S Sorry but I'm slightly confused. Where does the 9/2 come from for the general rule.

Does anyone know how to prove the equations for c (i) ?? Thank you in advanced! Yesterday, a tennis ball used in a game of cricket in the playground was hit onto the science block roof. Luckily it rolled off the roof. After bouncing on the playground it reached a height of 3 metres. After the...

Thank you so much. It helped me a lot. But one thing I found was that customers are also participant for self checkouts.

I'm analysing Woolworths transaction processing system and I'm confused with the users and participants for normal checkouts, self-checkouts and online websites. Are customers participants for online websites?????