Is this one correct? If not why and what is the correct one? 
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$\begingroup$ Strongly Related: chemistry.stackexchange.com/questions/33675/… $\endgroup$ – Nilay Ghosh Apr 15 '17 at 16:57
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$\begingroup$ Welcome to Chemistry! This is a homework question. We have a policy which states that you should show your thoughts and/or efforts into solving the problem. It'll make us certain that we aren't doing your homework for you. Otherwise, this question may get closed. Please edit in your full reasoning or thoughts on this. $\endgroup$ – Tyberius Apr 15 '17 at 16:59
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$\begingroup$ @Sneha Srikanth Visit Wikipedia: en.m.wikipedia.org/wiki/Phosphorus_pentachloride and head to the Reactions subheading. The mechanism is available there. $\endgroup$ – Pritt says Reinstate Monica Apr 21 '17 at 4:30
