Which of the following bonds are present in silicones?

Which of the following statements is correct for the compounds $HF, HBr, H_2Se, H_2Te, H_3P$?

$Si$ reacts with $CH_3Cl$ at $573 \ K$ in the presence of $Cu$ powder to form methyl substituted chlorosilanes. Among the given methyl substituted chlorosilanes,whose yield is minimum?

Which of the following statements is correct with respect to the properties of elements in the carbon family as the atomic number increases?

The effective component of bleaching powder is $.....$ of calcium.

The main reason that $SiCl_{4}$ is easily hydrolysed as compared to $CCl_{4}$ is that