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MCQEasyJEE 2026Electronic Effects (Inductive, Resonance, Hyperconjugation)

JEE Chemistry 2026 Question with Solution

Find out the statements which are not true.

A. Resonating structures with more covalent bonds and less charge separation are more stable.

B. In electromeric effect, an unsaturated system shows +E+E effect with nucleophile and −E-E effect with electrophile.

C. Inductive effect is responsible for high melting point, boiling point and dipole moment of polar compounds.

D. The greater the number of alkyl groups attached to the doubly bonded carbon atoms, higher is the heat of hydrogenation.

E. Stability of carbanion increases with increase in ss-character of the carbon carrying negative charge.

  • A

    B, D & E only

  • B

    A, D & E only

  • C

    B & D only

  • D

    A, C & D only

Answer

Correct answer:C

Step-by-step solution

Standard Method

Given: We must identify which statements are not true.

Find: The incorrect statements among A, B, C, D, E.

Step 1: Checking statement B The electromeric effect shows +E+E effect with an electrophile and −E-E effect with a nucleophile. Therefore statement B is false.

Step 2: Checking statement D More substituted alkenes are more stable. A more stable alkene has lower heat of hydrogenation, not higher. Therefore statement D is false.

Step 3: Checking the remaining statements The solution states that A, C and E are correct statements.

Therefore, the statements which are not true are B and D only. Hence, the correct option is C.

Elimination Trick

Given: We need only the false statements.

Find: The option containing all incorrect statements.

Use the quick stability rules from the hint and explanation:

  • In electromeric effect, +E+E is associated with an electrophile and −E-E with a nucleophile, so B is false.
  • Lower heat of hydrogenation means greater alkene stability, so statement D is false.

Now match B and D only with the options.

Therefore, the correct option is C.

Common mistakes

  • Confusing the electromeric effect directions. Students often reverse +E+E and −E-E. This is wrong because +E+E operates toward an electrophile and −E-E toward a nucleophile. Always identify the attacking reagent first.

  • Assuming more substituted alkenes have higher heat of hydrogenation. This is wrong because greater alkene stability corresponds to lower heat of hydrogenation. Compare stability and heat of hydrogenation inversely.

  • Marking statement C as false without support from the provided solution. The given explanation explicitly treats A, C, and E as correct. Base the final selection on the extracted solution, not on unsupported doubt.

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