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Organic Chemistry – Some Basic Principles and Techniques

NEET (UG) 2022MCQEasy📈 Topic in 25% papers+4−1
Ques. 1NEET (UG) 2022

Which compound amongst the following is not an aromatic compound?

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

Answer

(4) [figure]

Solution

As per NCERT (Hückel rule), a species is aromatic if it is cyclic and planar, has complete delocalisation of π electrons in the ring and contains (4n+2) π electrons.

(1) In the cyclopentadienyl anion every ring carbon is sp2 and there are 6 π electrons (n = 1), so it is aromatic.

(2) The cycloheptatrienyl (tropylium) cation is fully conjugated with 6 π electrons (n = 1), so it is aromatic.

(3) The cyclopropenyl cation is fully conjugated with 2 π electrons (n = 0), so it is aromatic.

(4) Cycloheptatriene has one sp3 CH2 carbon, so its π electrons are not delocalised over the whole ring, which makes it non-aromatic.

Answer: (4)

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Ques. 2NEET (UG) 2022

The correct IUPAC name of the following compound is [figure]

  1. 1-bromo-5-chloro-4-methylhexan-3-ol
  2. 6-bromo-2-chloro-4-methylhexan-4-ol
  3. 1-bromo-4-methyl-5-chlorohexan-3-ol
  4. 6-bromo-4-methyl-2-chlorohexan-4-ol
Ques. 3NEET (UG) 2022 (Phase 2)

What is the hybridization shown by C1 and C2 carbons, respectively in the given compound? OHC- 1CH=CH- 2CH2COOCH3

  1. sp3 and sp3
  2. sp2 and sp3
  3. sp2 and sp2
  4. sp3 and sp2
Ques. 4NEET (UG) 2022 (Phase 2)

Which of the following is the most stable carbocation?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 5NEET (UG) 2021

The correct structure of 2, 6-dimethyl-dec-4-ene is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6NEET (UG) 2020

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?

  1. +R effect of -CH3 groups
  2. -R effect of -CH3 groups
  3. Hyperconjugation
  4. -I effect of -CH3 groups
Ques. 7NEET (UG) 2019

The number of sigma ( ) and pi ( ) bonds in pent-3-en-1-yne is -

  1. 11 bonds and 2 bonds
  2. 13 bonds and no bonds
  3. 10 bonds and 3 bonds
  4. 8 bonds and 5 bonds
Ques. 8NEET 2018

Which of the following is correct with respect to -I effect of the substituents? (R = alkyl)

  1. -NH2 < -OR < -F
  2. -NR2 < -OR < -F
  3. -NH2 > -OR > -F
  4. -NR2 > -OR > -F
Ques. 9NEET 2018

Which of the following carbocations is expected to be most stable?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10NEET 2018

Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms?

  1. HC C - C CH
  2. CH2 = CH - C CH
  3. CH2 = CH - CH = CH2
  4. CH3 - CH = CH - CH3
Ques. 11NEET 2017

The correct statement regarding electrophile is

  1. electrophile is a negatively charged species and form a bond by accepting a pair of electrons from another electrophile
  2. electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile
  3. electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile
  4. electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile.

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