Which one of the following is an electrophilic addition reaction?

Hydroboration-oxidation of but$-1-$ene forms

Some addition reactions of alkene are given below. Identify the one which fits on $ALL$ the given criteria.
Reaction must have-
$(A)$ Stereochemistry of addition - $SYN$ $ONLY$
$(B)$ Regiochemistry of addition - $ANTI-MARKOVNIKOV$ $OR$ $ANTI-MARKOVNIKOV$ $LIKE$

Which of the following products are formed upon the addition reaction of $DCl$ with $3-methyl-1-butene$?

What are the products formed in the reaction given below:
$Ph-CH_2-CH=CH-CH_3 \xrightarrow[Zn \text{ dust } + H_2O]{1) O_3} ?$

Addition of $HBr$ to propene yields $2-$bromopropane,while in the presence of benzoyl peroxide,the same reaction yields $1-$bromopropane. Explain and give the mechanism.