Write the IUPAC Name of CH3CHBrCH2CH3

Explanation

`M=60, d=6.23gcm^(-3),a=400,Z=?`
`d=(Zxxm)/(a^3xxN_0)rArrZ=(d xx a^3xxN_0)/M`
`Z=(6.23xx(400)^3xx10^(-30)xx6.023xx10^(23))/60=(2401.4xx10^6xx10^(-30)xx10^(23))/60`
`Z=40.02xx10^(-1)=4.002`
Z = 4 i.e.,fcc unit cell
For fcc `r=a/(2sqrt2)=400/(2xx1.414)`
`r=400/(2.828)=141.4` pm