Silicon is unable to form $\mathrm{\pi }$ – bond by lateral overlap which is reflected by which option of the following.

SiO2 is a hard and high melting solid while CO₂ is a gas

There is no allotrope of silicon equivalent to the graphite

N(SiH₃)₃ and N(CH₃)₃ are pyramidal.

Me₂CCl₂ upon hydrolysis yields Me₂CO while Me₂SiCl₂ yields silicones