Q.

Which of the following is the most likely Lewis structure of nitrosyl chloride, NOCl

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a

\large \;\mathop {\mathop {_ \bullet ^ \bullet Cl}\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet } - \;\mathop {{\text{ }}N}\limits^{ \bullet \;\; \bullet } \; = \;\mathop {\mathop O\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet }

b

\large \mathop {\mathop {Cl}\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet } \; = \;\mathop N\limits^{ \bullet \;\; \bullet } \; - \;\mathop {\mathop {O_ \bullet ^ \bullet }\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet }

c

\mathop {\mathop {Cl}\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet } \; = \;N\; = \;\mathop {\mathop O\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet }

d

\mathop {\mathop {_ \bullet ^ \bullet Cl}\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet } \; - \;\mathop N\limits^{ \bullet \;\; \bullet } \; \equiv \;\mathop {\mathop O\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet } \

answer is B.

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Detailed Solution

\large \;\mathop {\mathop {_ \bullet ^ \bullet Cl}\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet } - \;\mathop {{\text{ }}N}\limits^{ \bullet \;\; \bullet } \; = \;\mathop {\mathop O\limits_{ \bullet \;\; \bullet } }\limits^{ \bullet \;\; \bullet }

Formal charge on Chlorine atom = 7 - 6 - 1 = 0

Formal charge on Nitrogen atom = 5 - 2 - 3 = 0

Formal charge on Oxygen atom = 6 - 4 - 2 = 0

Formal charge on all atoms is zero

A chargeless structure is highly stable which has a minimum energy

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