Use the following spectroscopic and reaction data to determine the structures of Compounds B and C$.$

Compound B$,C_7{H}_{12}$

IR: $1643c{m}^{-1}$

NMR: $5\mathrm{.}37ppm,1H,t$

$1\mathrm{.}96ppm,4H,m$

$1\mathrm{.}82ppm,3H,s$

$1\mathrm{.}74$ ppm$,4$H$,$ m

NMR: $3\mathrm{.}69$ ppm$,1$H$,$ t

$3\mathrm{.}30ppm,3H,s$

$2\mathrm{.}02ppm,2H,q$

$1\mathrm{.}66ppm,2H,t$

$1\mathrm{.}53ppm,4H,m$

$1\mathrm{.}29$ ppm$,3H,s$