Question

are the electron movements shown legal? i ii a. yes yes b. yes no c. no yes d. no no

Explanation:

Step1: Analyze electron - movement in I

In structure I, the arrow shows a lone - pair on the nitrogen moving to form a bond with the adjacent carbon. This is a valid resonance - type electron movement as it follows the rules of electron - pushing in organic chemistry, where a lone - pair can be used to form a new bond.

Step2: Analyze electron - movement in II

In structure II, the arrow shows an incorrect electron movement. The negative charge on the oxygen is being pushed in a way that violates the octet rule and the normal patterns of electron - movement in carbonyl - containing compounds. The correct electron - movement from a negatively charged oxygen in a carbonyl system would be to reform the carbon - oxygen double bond and push electrons from the adjacent $\pi$ - bond, not in the way shown.

Answer:

B. yes, no