Neco Model Questions Vol1 2019 Chemistry Question 50

Practice objective / multiple choice question 50 from the 2019 Neco Model Questions Vol1 Chemistry examination.

Neco Model Questions Vol1 2019 Chemistry Objective / Multiple Choice Hard Difficulty
Question 50 NECO_MODEL_QUESTIONS_VOL1 • 2019 • CHEMISTRY • objective

A chemist carries out the following sequence starting from 5.00 g of a pure carboxylic acid with molecular formula \(\mathrm{C_4H_8O_2}\): (1) esterification with excess ethanol in the presence of \(\mathrm{H_2SO_4}\) to give the ethyl ester; (2) reduction of the ester with \(\mathrm{LiAlH_4}\) to afford a primary alcohol; (3) oxidation of the alcohol with PCC to afford an aldehyde. (a) Identify the structure of the starting acid and give its IUPAC name. (b) Write the structural formula of the final aldehyde product. (c) Assuming 100 % yield in each step, calculate the theoretical mass of aldehyde obtained from the 5.00 g of acid.

Answer Options

Correct Answer A. a) Butanoic acid (CH₃CH₂CH₂COOH); b) Butanal (CH₃CH₂CH₂CHO); c) 4.09 g
B. a) Butanoic acid (CH₃CH₂CH₂COOH); b) Butanal (CH₃CH₂CH₂CHO); c) 5.00 g
C. a) Butanoic acid (CH₃CH₂CH₂COOH); b) Butanone (CH₃CH₂COCH₃); c) 4.09 g
D. a) Propanoic acid (CH₃CH₂COOH); b) Propanal (CH₃CH₂CHO); c) 3.08 g
Correct Answer
A
Correct Option:
a) Butanoic acid (CH₃CH₂CH₂COOH); b) Butanal (CH₃CH₂CH₂CHO); c) 4.09 g

About This Question

This is Neco Model Questions Vol1 2019 Chemistry Question 50. It is one of the objective questions from the 2019 Neco Model Questions Vol1 Chemistry examination.

Difficulty level: Hard .

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