Ncert Exercises & Solutions

Which of the following attain the linear structure?

1. ${BeCl}_{2}$

2. ${NCO}^{+}$

3. ${NO}_{2}$

4. ${CS}_{2}$

(a, d)

{BeCl}_{2} (Cl - Be - Cl)

and

{CS}_{2} (S = C = S)

both are linear.

{NCO}^{+}

is non-linear. However, [remember that

{}_{-}{NCO} ({}_{-}N = C = O)

is linear because it is isoelectronic with

{CO}_{2}

{NO}_{2}

is angular with bond angle

132 °

and each O-N bond length of 1.20 Å (intermediate between single and double bond).