Question

Question 2 0/2 pts In the reaction of a ketone with sodium borohydride with methanol, the Select ) is the nucleophile while the [Select] is the electrophile. Answer 1: You Answered You left this blank) Correct Answer hydride Answer 2: You Answered (You left this blank) Correct Answer carbonyl carbon Haier

Answer 1

Reaction of ketone with Sodium borohydride (Na BH4) is reduction reaction, in this reduction of ketone to alcohol is done by Na BHly. Let's see mechanism of Na B Hy reduction, consider, acetone as our ketone for better understanding. Reach OM 13 - C - CHE + NOBH4 CH₃ -CH-CH₃ Kelone Alcohol Alcohol 0 CH3 01 Mechanism : So, in first step addition of hydride jon ie (H+) is done on the carbonyl carbon of kebone. So, here hydride acts as nucleophile and carbonyl carbon acts as electrophile. Protonation is done by naethano . OH CH₃-CH CH₂ L Alcohol. To Wat CH₃ - C - CH3 + (H-B-H CHz~ CH-CH3 -Hydride. carbonyl carbon . donales electrons Jo electrophile for Accepts elechons in the form of hydride bond formation go acts as nucleophile 80 ads as electrophile.