Write the major product of the following reaction: $Ph-CH_2-CH=CH_2 \xrightarrow{HBr, \text{Peroxide}}$

Which of the following alkenes yield $3-$bromo$-3-$methylpentane as the major product upon addition of $HBr$?
$(I)$ $3-$methylpent$-2-$ene
$(II)$ $3-$methylpent$-2-$ene (isomer)
$(III)$ $3-$ethylpent$-1-$ene
$(IV)$ $3-$methylpent$-1-$ene

What are the $IUPAC$ nomenclature rules for naming alkenes?

What is the product obtained when the compound $CH_3-C(CH_3)=CH-CH_3$ reacts in the presence of $NaIO_4/KMnO_4$?

Out of the following,the alkene that exhibits optical isomerism is

The stability order of the given alkenes is