In the context of chemistry, yes. Energy input is always equal to the energy output.
        
             
        
        
        
Phosgene on reacting with <span>phenylmagnesium bromide generates 
benzoyl chloride. 
Since, </span>phenylmagnesium bromide is added in excess. It would further react with benzoyl chloride to form 
benzophenone. 
Benzophenone on further reacting with phenylmagnesium bromide, and aqueous treatment, gives 
triphenylmethanol. 
Entire reaction pathways is shown below:
 
        
        
        
Answer:
4
Explanation:
your chosen answer is right as unsaturated mean contains double bond and 1st and 3rd is Wrong as Carbon only can have 4 bonds and 2nd is Wrong as it is saturated.
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