Basics of Organic Reaction Mechanism MCQs Question and Answer in Engineering Chemistry Page-5 section-1

41.
Among the carboxylic acid shown below, the ones that exhibit stereoisomerism and also form, cyclic anhydrides on heating are
I. HOOCCH(CH₃)CH₂CH₂COOH
II. HOOCCH(C₃H₇)COOH
III. HOOCCH(C₂H₅)CH₂COOH
IV. HOOCC(CH₃)(C₂H₅)COOH

A. I and II

B. I and III

C. II and III

D. II and IV

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42.
Match the following compounds with their respective classes

A. I:steroid; II:terpenoid; III:alkaloid; IV:DNA base

B. I:terpenoid; II:steroid; III:alkaloid; IV:DNA base

C. I:terpenoid; II:steroid; III:DNA base; IV:alkaloid

D. I:steroid; II:terpenoid; III:DNA base; IV:alkaloid

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43.
The sequence of an mRNA molecule produced from a DNA template strand with the composition 5'-AGCTACACT-3' is

A. 5'-AGUGUAGCU-3'

B. 5'-UCGAUGUGA-3'

C. 5'-AGTGTAGCT-3'

D. 5'-TCGATGTGA-3'

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44.
Pyrrole + PhMgBr → E + F
E + MeCl → G + H
F + MeCl → no reaction without a catalyst

The structure of products E - H respectively are

A. 3, 2, 6, 7

B. 4, 5, 6, 1

C. 3, 4, 5, 2

D. 3, 2, 4, 5

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45.
The mono protonation of adenine (X) in acidic solution mainly occurs at

A. position 1

B. position 2

C. position 3

D. position 4 or 5

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46.
The molecules(s) that exist as meso structure (s)

is/are

A. only M

B. both K and L

C. only L

D. only K

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47.
Three molecular ionic states, P-R are possible for the amino acid histidine. Identify the correct choice of pH values, respectively for the observation of the ionic states P-R.

A. P at pH 1; Q at pH 12; R at pH 7

B. P at pH 7; Q at pH 1; R at pH 12

C. P at pH 12; Q at pH 7; R at pH 1

D. P at pH 12; Q at pH 1; R at pH 7

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48.
In allene, hybridization of the central and terminal carbons respectively, are

A. sp² and sp²

B. sp² and sp³

C. sp and sp²

D. sp and sp³

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49.
Benzene cannot be iodinated with $${I_2}$$ directly. However, in presence of oxidants such as HNO₃, iodination is possible. The electrophiles formed in the case is

A. $$\left[ {{I^ + }} \right]$$

B. $$\left[ {{I^ - }} \right]$$

C. $${\left[ {\mathop I\limits^{ + \delta } ...\mathop O\limits^{ + \delta } {H_2}} \right]^ + }$$

D. $${\left[ {\mathop I\limits^{ + \delta } ...\mathop O\limits^{ - \delta } {H_2}} \right]^ + }$$

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50.
In electrophilic aromatic substitution reactions, nitro group is meta-directing because the nitro group

A. increases electron density at meta-position

B. increases electron density at ortho and para-positions

C. decreases electron density at meta-position

D. decreases electron density at ortho and para-positions

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

41. Among the carboxylic acid shown below, the ones that exhibit stereoisomerism and also form, cyclic anhydrides on heating are I. HOOCCH(CH3)CH2CH2COOH II. HOOCCH(C3H7)COOH III. HOOCCH(C2H5)CH2COOH IV. HOOCC(CH3)(C2H5)COOH

Answer & Solution

42. Match the following compounds with their respective classes

Answer & Solution

43. The sequence of an mRNA molecule produced from a DNA template strand with the composition 5'-AGCTACACT-3' is

Answer & Solution

44. Pyrrole + PhMgBr → E + F E + MeCl → G + H F + MeCl → no reaction without a catalyst The structure of products E - H respectively are

Answer & Solution

45. The mono protonation of adenine (X) in acidic solution mainly occurs at

Answer & Solution

46. The molecules(s) that exist as meso structure (s) is/are

Answer & Solution

47. Three molecular ionic states, P-R are possible for the amino acid histidine. Identify the correct choice of pH values, respectively for the observation of the ionic states P-R.

Answer & Solution

48. In allene, hybridization of the central and terminal carbons respectively, are

Answer & Solution

49. Benzene cannot be iodinated with $${I_2}$$ directly. However, in presence of oxidants such as HNO3, iodination is possible. The electrophiles formed in the case is

Answer & Solution

50. In electrophilic aromatic substitution reactions, nitro group is meta-directing because the nitro group

Answer & Solution

Read More Section(Basics of Organic Reaction Mechanism)

41.
Among the carboxylic acid shown below, the ones that exhibit stereoisomerism and also form, cyclic anhydrides on heating are
I. HOOCCH(CH₃)CH₂CH₂COOH
II. HOOCCH(C₃H₇)COOH
III. HOOCCH(C₂H₅)CH₂COOH
IV. HOOCC(CH₃)(C₂H₅)COOH

42.
Match the following compounds with their respective classes

43.
The sequence of an mRNA molecule produced from a DNA template strand with the composition 5'-AGCTACACT-3' is

44.
Pyrrole + PhMgBr → E + F
E + MeCl → G + H
F + MeCl → no reaction without a catalyst

The structure of products E - H respectively are

45.
The mono protonation of adenine (X) in acidic solution mainly occurs at

46.
The molecules(s) that exist as meso structure (s)

is/are

47.
Three molecular ionic states, P-R are possible for the amino acid histidine. Identify the correct choice of pH values, respectively for the observation of the ionic states P-R.

48.
In allene, hybridization of the central and terminal carbons respectively, are

49.
Benzene cannot be iodinated with $${I_2}$$ directly. However, in presence of oxidants such as HNO₃, iodination is possible. The electrophiles formed in the case is

50.
In electrophilic aromatic substitution reactions, nitro group is meta-directing because the nitro group