Number of lone pairs of electrons in the central atom of SCl 2 , O 3 , ClF 3 and SF 6 , respectively, are

The Lewis dot structure of the given molecules will be the following.

As we can see in above structures that $$\begin{gathered} {\mathrm{SCl}}_2 \mathrm{has} 2 \mathrm{lone} \mathrm{pair} \mathrm{and} 2 \mathrm{bond} \mathrm{pair}, {\mathrm{O}}_3 \mathrm{has} \mathrm{one} \mathrm{lone} \mathrm{pair} \mathrm{and} \mathrm{two} \mathrm{bond} \mathrm{pair}, \\ {\mathrm{ClF}}_3 \mathrm{has} \mathrm{two} \mathrm{lone} \mathrm{pair} \mathrm{and} 3 \mathrm{bond} \mathrm{pair} \mathrm{and} {\mathrm{SF}}_6 \mathrm{has} 0 \mathrm{lone} \mathrm{pair} \mathrm{and} 6 \mathrm{bond} \mathrm{pair} \end{gathered}$$