Explain why fluorobenzene is more reactive than chlorobenzene toward electrophilic aromatic substitution but chloromethylbenzene is more reactive than fluoromethylbenzene.

Explanation:

The order of positive mesomeric effect (+M) is as follows

F>Cl>Br>I.

This implies that electron density in the respective Halobenzene is of the order

Fluorobenzene > Chlorobenzene > Iodobenzene.

This means that electrophilic aromatic substitution will also follow the same order, more the electron density more will be chances of electrophilic aromatic substitution. This means  fluorobenzene is more reactive than chlorobenzene toward electrophilic aromatic substitution

However, methyl group is attached in ring, beacuse of starric hindrance, chloromethylbenzene is more reactive than fluoromethylbenzene.

odds are decent that your handwriting right now looks a little bit different than it did five years ago, and will look different again in five more. when i look back through my notebooks from middle school to now, i see a long, slow progression from meticulous and teeny letters to bigger, sloppier ones, plus a few side detours: sometime in high school, for example, i decided those loopy cursive lowercase f’s were just the coolest, adopting them as the lone rep for cursive in my otherwise all-print handwriting.

explanation:

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.