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Test: Inductive, mesomeric and electromeric effects - Chemistry MCQ


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15 Questions MCQ Test - Test: Inductive, mesomeric and electromeric effects

Test: Inductive, mesomeric and electromeric effects for Chemistry 2024 is part of Chemistry preparation. The Test: Inductive, mesomeric and electromeric effects questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Inductive, mesomeric and electromeric effects MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Inductive, mesomeric and electromeric effects below.
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Test: Inductive, mesomeric and electromeric effects - Question 1

Arrange the following groups in the order of decreasing (+I) effect.

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 1

The correct order is- C6H5O > COO > CR3 > CHR2 > H.

Test: Inductive, mesomeric and electromeric effects - Question 2

Which of the following is an application of the mesomeric effect?

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 2

Dipole moment, strength of acids and bases and bond length are some of the applications of the mesomeric effect.

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Test: Inductive, mesomeric and electromeric effects - Question 3

Which of the following is an example of lewis base?

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 3

NH3 is an example of lewis base and ZnCl2, BF3 and FeCl2 are the examples of lewis acid.

Test: Inductive, mesomeric and electromeric effects - Question 4

Arrange the following groups in the order of decreasing (-I) effect.

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 4

The correct order is- CN > COOH > F > Cl > Br > I > H.

Test: Inductive, mesomeric and electromeric effects - Question 5

Select the correct statement from the following option.

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 5

All the bond length in the benzene ring is equal due to resonance. All the bond lengths are equal in benzene ring i.e. double bond as well as single bond due to resonance.

Test: Inductive, mesomeric and electromeric effects - Question 6

Which of the following is an incorrect statement about the nucleophiles?

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 6

Nucleophiles possess an unshared electron pair which is not firmly held to the nucleus. All the other options are correct. They are electron rich and attack on electron deficient centres. Examples are: OH, NH3, H2O etc.

Test: Inductive, mesomeric and electromeric effects - Question 7

Which of the following is an application of inductive effect?

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 7

Bond length, dipole moment and strength of carboxylic acids are some of the applications of inductive effect.

Test: Inductive, mesomeric and electromeric effects - Question 8

Greater the number of resonating structures for a given intermediate __________

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 8

Greater the number of resonating structures for a given intermediate, more will be its stability. More resonating structure increases stability.

Test: Inductive, mesomeric and electromeric effects - Question 9

Those groups which are electron repelling and have lesser electron attracting power than hydrogen show __________

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 9

Those groups which are electron repelling and have lesser electron attracting power than hydrogen show (+I) effect.

Test: Inductive, mesomeric and electromeric effects - Question 10

Relative basic strength of amines does not depend upon ____________

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 10

Relative basic strength of amines does not depend upon mesomeric effect. This effect is used in a qualitative way and describes the electron withdrawing or releasing properties of substituents based on relevant resonance structures.

Test: Inductive, mesomeric and electromeric effects - Question 11

Phenyl group show __________

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 11

Phenyl group show (-M) effect. The phenyl group or phenyl ring is a cyclic group of atoms with the formula C6H5.

Test: Inductive, mesomeric and electromeric effects - Question 12

Which of the following molecule will show highest dipole moment?

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 12

Explanation for correct option:

C. CH3Cl

Dipole moment:

  • “Dipole moment is defined as the product of the magnitude of the charge and the distance between the centers of positive and negative charge”
  • It is expressed as μμμ.

The trend for dipole moment in the case of halogens are:

  • Dipole moment depends on charge and distance.
  • The difference in electronegativity between carbon and halogen atom decreases on going down the group from Fluorine to Iodine because of the decrease in electronegativity of halogen down the group.
  • On the other hand, the distance between carbon and halogen atom increases on going down the group from Fluorine to Iodine because of the increase in size on moving down the group in the halogen family.
  • The dipole moment of CH3Cl is greater than that of CH3F as the electron affinity of chlorine is greater than that of fluorine. The charge separation is larger in CH3Cl compared to CH3F. The repulsion between the bond pairs and non–bonded pairs of electrons is greater in CH3Cl than CH3F.
  • Thus, the charge and distance factors are opposite to each other, in this case, the charge factor dominates. Therefore, the order will be CH3Cl>CH3F>CH3Br>CH3I.

Explanation for incorrect options:

The order of the dipole moment is CH3Cl>CH3F>CH3Br>CH3I. Thus, CH3Cl will have the maximum dipole moment.

Test: Inductive, mesomeric and electromeric effects - Question 13

Due to presence of C – X polar bond in alkyl halide, alkyl halides are ________

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 13

Due to the presence of C – X polar bond in alkyl halide, alkyl halides are more reactive than corresponding alkane.

Test: Inductive, mesomeric and electromeric effects - Question 14

Dipole moment of CH3-CH2-Cl > CH2=CH-Cl.

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 14

Dipole moment of CH3-CH2-Cl > CH2=CH-Cl. This is due to resonance in vinyl chloride.

Test: Inductive, mesomeric and electromeric effects - Question 15

Lewis acids are examples of nucleophilic reagents.

Detailed Solution for Test: Inductive, mesomeric and electromeric effects - Question 15

Lewis acids are the examples of electrophilic reagents and Lewis bases are the examples of nucleophilic reagents.

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