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Organic Chemistry – Some Basic Principles and Techniques · Question 13

NEET (UG) 2022 (Phase 2)MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(2) sp2 and sp3

Solution

C1 is a doubly bonded carbon (-CH=): three σ bonds + one π bond sp2.

C2 is the -CH2- carbon with four single (σ) bonds sp3.

Answer: (2)

NEET (UG) 2022 (Phase 2)

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

2

Which of the following is the most stable carbocation?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET (UG) 2022 (Phase 2)
3

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

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

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
NEET (UG) 2020
5

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
NEET (UG) 2019
6

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
NEET 2018
7

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
NEET 2018
8

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
NEET 2018
9

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.
NEET 2017
10

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
NEET 2017
11

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
NEET 2017

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