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How do you decided which compound is the most or less reactive towards electrophilic substitution? For example, if the compounds are benzene, ethyl benzene, 2-phenylpropane and 2-methyl-2-phenylpropane?

Compounds

Most reactive towards electrophilic substitution means that the compound itself needs to be an electrophile (so that they don't combine), this means there needs to be a +I effect, right? But +I effect increases with an increase in the number of alkyl groups, so that would indicate that 2-methyl-2-phenylpropane would be the most reactive, but benzene is the answer for the question. Thanks in advance!

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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. $\endgroup$ – M.A.R. Jun 25 '16 at 16:29
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    $\begingroup$ You misunderstood question or there's a mistake. Steric effect is also important but not that much $\endgroup$ – Mithoron Jun 25 '16 at 16:55
  • $\begingroup$ Then how would I go about answering the question? Which factors are considered first? $\endgroup$ – PC123 Jun 25 '16 at 17:35
  • $\begingroup$ see this earlier answer $\endgroup$ – ron Jun 25 '16 at 17:57