The bond angle between carbon atoms in a benzene molecule is

What will be the product $A$ in the reaction given below?

What is the expected order of reactivity of the following compounds in electrophilic chlorination $(Cl_2 + FeCl_3)$? (more reactive $ > $ less reactive)
$I: C_6H_5CH_2CO_2H$
$II: C_6H_5N(CH_3)_2$
$III: C_6H_5OCOCH_3$
$IV: C_6H_5CCl_3$

The total number of benzene derivatives with the molecular formula $C_6H_3Cl_3$ is:

$ClCH_2-CH_2Cl$ $\xrightarrow[(ii) NaNH_2]{(i) Alc. KOH}$ $A$ $\xrightarrow{\text{Red hot Fe tube}}$ $B$
Identify product $B$ in the above reaction sequence.

Among the following compounds $(I-III)$,the correct order of reactivity towards electrophilic substitution reaction is: