Which of the following compounds follows the octet rule?

The electronic configuration of $X$ and $Y$ are given below:
$X: 1s^2 2s^2 2p^6 3s^2 3p^3$
$Y: 1s^2 2s^2 2p^6 3s^2 3p^5$
Which of the following is the correct molecular formula and type of bond formed between $X$ and $Y$?

$Mg_2C_3$ reacts with water to form propyne gas. The $C_3^{4-}$ ion has:

Which set contains only covalently bonded molecules?

For the formation of a covalent bond,the difference in the value of electronegativities should be

$A$ covalent bond is likely to be formed between two elements which