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Organic Chemistry – Some Basic Principles and Techniques

NEET 2017MCQMedium📈 Topic in 12% papers+4−1
Ques. 1NEET 2017

The IUPAC name of the compound [figure]

  1. 5-formylhex-2-en-3-one
  2. 5-methyl-4-oxohex-2-en-5-al
  3. 3-keto-2-methylhex-5-enal
  4. 3-keto-2-methylhex-4-enal

Answer

(4) 3-keto-2-methylhex-4-enal

Solution

Principal functional group: –CHO ⇒ suffix '-al'; its carbon is C-1.

Longest chain containing –CHO and the C=C has 6 carbons:

1CHO- 2CH(CH3)- 3CO- 4CH= 5CH- 6CH3

Substituents: methyl at C-2, keto (oxo) group at C-3; double bond between C-4 and C-5 ⇒ hex-4-enal.

∴ Name: 3-keto-2-methylhex-4-enal (keto = oxo; in current IUPAC style written 2-methyl-3-oxohex-4-enal).

Answer: (4)

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Ques. 2NEET 2017

Which one is the correct order of acidity?

  1. CH CH > CH3-C CH > CH2=CH2 > CH3-CH3
  2. CH CH > CH2=CH2 > CH3-C CH > CH3-CH3
  3. CH3-CH3 > CH2=CH2 > CH3-C CH > CH CH
  4. CH2=CH2 > CH3-CH=CH2 > CH3-C CH > CH CH
Ques. 3NEET 2016 (Phase 1)

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.
Ques. 4NEET 2016 (Phase 1)

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
Ques. 5NEET 2016 (Phase 2)

In which of the following molecules, atoms are coplanar?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6NEET 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. 7AIPMT 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. 8AIPMT 2015 (Cancelled)

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

  1. 12
  2. 16
  3. 4
  4. 8
Ques. 9AIPMT 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. 10AIPMT 2015 (Cancelled)

Consider the following compounds : [figure] Hyperconjugation occurs in

  1. III only
  2. I and III
  3. I only
  4. II only
Ques. 11AIPMT 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.

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