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Organic Chemistry – Some Basic Principles and Techniques

NEET 2016 (Phase 2)MCQMediumNot asked in last 5 yrs+4−1
Ques. 1NEET 2016 (Phase 2)

In which of the following molecules, atoms are coplanar?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

Answer

(1) [figure]

Solution

(1) Biphenyl: all 12 C atoms are sp2 and the two rings are joined by a C–C single bond; the molecule is planar (as in the solid), so all its atoms lie in one plane.

(2) Cyclohexane: sp3 carbons ⇒ non-planar (chair form).

(3) The two CH3 carbons are sp3 ⇒ their H atoms cannot all lie in the molecular plane.

(4) Bicyclohexyl: all carbons sp3 ⇒ non-planar.

Answer: (1)

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Ques. 2NEET 2016 (Phase 2)

In pyrrole the electron density is maximum on [figure]

  1. 2 and 3
  2. 3 and 4
  3. 2 and 4
  4. 2 and 5
Ques. 3AIPMT 2015

Which of the following statements is not correct for a nucleophile?

  1. Ammonia is a nucleophile.
  2. Nucleophiles attack low e- density sites.
  3. Nucleophiles are not electron seeking.
  4. Nucleophile is a Lewis acid.
Ques. 4AIPMT 2015 (Cancelled)

The total number of π-bond electrons in the following structure is [figure]

  1. 12
  2. 16
  3. 4
  4. 8
Ques. 5AIPMT 2015 (Cancelled)

Which of the following is the most correct electron displacement for a nucleophilic reaction to take place?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6AIPMT 2015 (Cancelled)

Consider the following compounds : [figure] Hyperconjugation occurs in

  1. III only
  2. I and III
  3. I only
  4. II only
Ques. 7AIPMT 2015 (Cancelled)

The enolic form of ethyl acetoacetate as shown below has [figure]

  1. 9 sigma bonds and 2 pi-bonds
  2. 9 sigma bonds and 1 pi-bond
  3. 18 sigma bonds and 2 pi-bonds
  4. 16 sigma bonds and 1 pi-bond.
Ques. 8AIPMT 2015 (Cancelled)

In which of the following compounds, the C–Cl bond ionisation shall give most stable carbonium ion?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 9AIPMT 2015 (Cancelled)

Given : [figure] The enthalpy of hydrogenation of these compounds will be in the order as

  1. II > III > I
  2. II > I > III
  3. I > II > III
  4. III > II > I
Ques. 10AIPMT 2014

Which of the following organic compounds has same hybridization as its combustion product (CO2)?

  1. Ethane
  2. Ethyne
  3. Ethene
  4. Ethanol
Ques. 11NEET 2013

The radical, [figure] is aromatic because it has

  1. 7 p-orbitals and 7 unpaired electrons
  2. 6 p-orbitals and 7 unpaired electrons
  3. 6 p-orbitals and 6 unpaired electrons
  4. 7 p-orbitals and 6 unpaired electrons.

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