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Organic Chemistry – Some Basic Principles and Techniques

NEET (UG) 2021MCQMedium📈 Topic in 12% papers+4−1
Ques. 1NEET (UG) 2021

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

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

Answer

(1) [figure]

Solution

2,6-Dimethyldec-4-ene: CH3-CH(CH3)-CH2-CH=CH-CH(CH3)-CH2-CH2-CH2-CH3

In every structure the longest chain has 10 C; number it from the end that gives the double bond the lowest locant.

(1) From the isopropyl end: CH3 at C-2, C-4 = C-5, CH3 at C-6 ⇒ 2,6-dimethyldec-4-ene

(2) Double bond C-3, CH3 at C-6 and C-9 ⇒ 6,9-dimethyldec-3-ene

(3) Double bond C-3, CH3 at C-2 and C-6 ⇒ 2,6-dimethyldec-3-ene

(4) Double bond C-5, CH3 at C-2 and C-6 ⇒ 2,6-dimethyldec-5-ene

Answer: (1)

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Ques. 2NEET (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. 3NEET (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. 4NEET 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. 5NEET 2018

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 6NEET 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. 7NEET 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.
Ques. 8NEET 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
Ques. 9NEET 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. 10NEET 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. 11NEET 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

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