Tetrahydroborate ion is the source of_______________?
Correct answer: D. H-
- A. proton
- B. H+
- C. both A & amp; B
- D. H-
Explanation
The tetrahydroborate ion, BH4-, supplies hydride, H-, which attacks the carbonyl carbon and reduces aldehydes or ketones to alcohols. Students may choose H+ because reduction is often associated with addition of hydrogen, but the hydrogen transferred in this reagent's mechanism is hydride, not a proton.
Report an error
The more specific you are, the faster it gets fixed. A source beats an opinion.
Prefer email? [email protected]
About Reactivity of Aldehydes and Ketones
The polar carbonyl group makes aldehydes and ketones undergo nucleophilic addition, reduction and condensation reactions. Aldehydes are generally more reactive and oxidise readily to carboxylic acids, whereas ketones resist mild oxidation; reactions with hydrogen cyanide, sodium bisulfite and 2,4-DNP help identify their behaviour.
Practise Aldehydes and Ketones
679 free Aldehydes and Ketones MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Discussion
Stuck on an option, or know a faster way to get there? Ask or explain it here.
No comments yet. Be the first to explain this one.
Exams that ask Chemistry questions like this
Chemistry is on 14 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
More Reactivity of Aldehydes and Ketones questions
Cannizaros reaction takes place through the transfer of ____________________ from complex anion?
Iodoform test can be used to distinguish between_________________?
Which of the following will have the highest boiling point ?
Which of the following is not a use of acetaldehyde ?
Which of the following is not a use of formaldehyde ?
Ketones are comparatively less reactive than aldehdye. It is due to_______________?