Neco 2022 Chemistry Question 7

Practice objective / multiple choice question 7 from the 2022 Neco Chemistry examination.

Neco 2022 Chemistry Objective / Multiple Choice Medium Difficulty
Question 7 NECO • 2022 • CHEMISTRY • objective

Benzaldehyde (C_{6}H_{5}CHO) is converted into p‑nitroacetophenone (C_{8}H_{7}NO_{3}) in three successive steps: (1) addition of methylmagnesium bromide followed by acidic work‑up, (2) oxidation of the resulting secondary alcohol to a ketone, and (3) electrophilic nitration that installs a nitro group para to the carbonyl. If 5.00\,g of benzaldehyde is used and each step gives an 80\% isolated yield, calculate (a) the overall theoretical mass of p‑nitroacetophenone obtainable and (b) write the overall balanced equation for the transformation (showing the stoichiometric relationship between benzaldehyde and p‑nitroacetophenone).

Answer Options

A. Mass of p‑nitroacetophenone ≈ 3.2\\,g; overall stoichiometry: 1 mol C_{6}H_{5}CHO → 1 mol C_{8}H_{7}NO_{3}
B. Mass of p‑nitroacetophenone ≈ 4.8\\,g; overall stoichiometry: 1 mol C_{6}H_{5}CHO → 1.2 mol C_{8}H_{7}NO_{3}
Correct Answer C. Mass of p‑nitroacetophenone ≈ 4.0\,g; overall stoichiometry: 1 mol C_{6}H_{5}CHO → 1 mol C_{8}H_{7}NO_{3}
D. Mass of p‑nitroacetophenone ≈ 5.0\\,g; overall stoichiometry: 1 mol C_{6}H_{5}CHO → 0.8 mol C_{8}H_{7}NO_{3}
Correct Answer
C
Correct Option:
Mass of p‑nitroacetophenone ≈ 4.0\,g; overall stoichiometry: 1 mol C_{6}H_{5}CHO → 1 mol C_{8}H_{7}NO_{3}

About This Question

This is Neco 2022 Chemistry Question 7. It is one of the objective questions from the 2022 Neco Chemistry examination.

Difficulty level: Medium .

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