The product formed in the following chemical reaction is :

The correct answer is:

Step-by-Step Explanation:

1. Analyze the Starting Reactant:
The reactant shown in the reaction image contains two functional groups capable of reduction:
• A ketone carbonyl group (cyclohexanone ring carbonyl, -C=O)
• An ester group (-CH₂-COOCH₃) attached as a side chain to the cyclohexane ring.

2. Understand the Reactant and Chemoselectivity of NaBH₄:
The reagent specified in the reaction is sodium borohydride in ethanol:

${\text{NaBH}}_4\text{ in }{\text{C}}_2{\text{H}}_5\text{OH}$

• Sodium borohydride (${\text{NaBH}}_4$) is a mild reducing agent.
• It selectively reduces aldehydes and ketones to their corresponding alcohols.
• Under standard conditions, ${\text{NaBH}}_4$ is not reactive enough to reduce esters, carboxylic acids, or amides because the ester carbonyl carbon is less electrophilic due to resonance donation from the alkoxy oxygen.

3. Predict the Product:
• The ring ketone carbonyl carbon ($\text{C=O}$) is selectively reduced by hydride (${\text{H}}^{-}$) transfer to form a secondary alcohol group ($\text{-OH}$).
• The ester group (${\text{-CH}}_2{\text{-COOCH}}_3$) remains completely unreacted/intact.

Thus, the structure of the main product formed is: