Organic Chemistry – Some Basic Principles and Techniques

For the following reactions : (A) CH3CH2CH2Br + KOH CH3CH=CH2 + KBr + H2O (B) [figure] (C) [figure] Which of the following statements is correct?

1. (A) is elimination, (B) and (C) are substitution reactions.
2. (A) is substitution, (B) and (C) are addition reactions.
3. (A) and (B) are elimination reactions and (C) is addition reaction.
4. (A) is elimination, (B) is substitution and (C) is addition reaction.

The pair of electrons in the given carbanion, CH3C C-, is present in which of the following orbitals?

1. sp2
2. sp
3. 2p
4. sp3

In which of the following molecules, atoms are coplanar?

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

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

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.

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

1. 12
2. 16
3. 4
4. 8

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]

Consider the following compounds : [figure] Hyperconjugation occurs in

1. III only
2. I and III
3. I only
4. II only

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.

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]