Basics of Organic Reaction Mechanism MCQs Question and Answer in Engineering Chemistry

21

Among formaldehyde, acetaldehyde and benzaldehyde, the aldehydes which undergo Cannizzaro's reaction are

A) all the three B) formaldehyde and acetaldehyde C) acetaldehyde and benzaldehyde D) formaldehyde and benzaldehyde

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Answer & Solution

Answer: Option D

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22

1-hexyne upon treatment with disiamylborane followed by the oxidation with H₂O₂ gives

A) hexanoic acid B) hexenol C) hexanal D) hexanol

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Answer & Solution

Answer: Option C

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23

The configurations at the three chiral centres in the bicyclodecanol given below, are
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A) 1S, 2S, 6R B) 1S, 2S, 6S C) 1R, 2R, 6R D) 1R, 2S, 6R

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Answer & Solution

Answer: Option D

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24

For the aldotetroses I-IV, the combination of true statements, among P-T, is
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P = I and II are diastereomers and II and III are enantiomers
Q = I and IV are mesomers and are optically inactive
R = I and III can be interconverted by a base catalysed isomerisation
S = only I and IV are HlO₄ cleavable
T = I and III are D-sugars and II and IV are L-sugars

A) Q, R, T B) P, R, T C) Q, R, S, T D) P, Q, S

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Answer & Solution

Answer: Option D

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25

Which one of the following molecules will have n → \[\mathop \pi \limits^ * \] transition at the longest wavelength?

A) HCHO B) CH₃COC₂H₅ C) C₆H₅COC₆H₅ D) CH₃COC₆H₅

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Answer & Solution

Answer: Option C

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26

The correct order of-the basicity of the following compounds is
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A) IV > III > II > I B) III > IV > I > II C) IV > III > I > II D) III > IV > II > I

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Answer & Solution

Answer: Option C

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27

Reaction of phenyl acetate with anhydrous aluminium chloride generates a mixture of

A) ortho, meta and para hydroxyacetophenones B) meta and para hydroxyacetophenones C) ortho and meta hydroxyacetophenones D) ortho and para hydroxyacetophenones

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Answer & Solution

Answer: Option A

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28

The pK_a values for the three ionisable groups X, Y and Z of glutamic acid are 4.3, 9.7 and 2.2 respectively
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The isoelectric point for the amino acid is

A) 7.00 B) 3.25 C) 4.95 D) 5.95

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Answer & Solution

Answer: Option B

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29

Among the isomers of C₄H₆ given below, the compound which exhibits an absorption band at 3300 cm^-1 in the IR spectrum, is

A) 1, 3-butadiene B) 1-butyne C) 2-butyne D) cyclobutene

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Answer & Solution

Answer: Option B

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30

Toluene when refluxed with Br₂ in the presence of light mainly gives

A) o-bromotoluene B) p-bromotoluene C) mixture of o- and p-bromotoluene D) benzylbromide

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Answer & Solution

Answer: Option D

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