- Aiso-propyl iodide
- Bsec-butyl iodide
- Ctert-butyl bromide
- Dneo-hexyl chloride
Explanation:
Neo-hexyl chloride is the primary halide. Because in it Cl atom is attached to a primary carbon atom. It is can be seen in its structure.
While others are not primary halides. They are secondary or tertiary halides.

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$(A)$ The number of $Cl = O$ bonds in $(ii)$ and $(iii)$ together is two
$(B)$ The number of lone pairs of electrons on $Cl$ in $(ii)$ and $(iii)$ together is three
$(C)$ The hybridization of $Cl$ in $(iv)$ is $sp ^3$
$(D)$ Amongst $(i)$ to $(iv)$, the strongest acid is $(i)$
$(II)$ $1,3-$dihydroxy benzene
$(III)$ $1,4-$dihydroxy benzene
$(IV)$ Hydroxy benzene
The increasing order of boiling points of above mentioned alcohols is