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Organic Chemistry – Some Basic Principles and Techniques · Question 62

AIPMT 2005MCQEasy📈 Topic in 38% papers+4−1
1

Which amongst the following is the most stable carbocation?

  1. CH3
  2. CH3 CH2
  3. CH3- CH3 | CH
  4. CH3- CH3 | CH3 | C

Answer

(4) CH3- CH3 | CH3 | C

Solution

As per NCERT, the stability of carbocations increases with the number of alkyl groups on the positive carbon, because of the +I effect and hyperconjugation (more C–H bonds in conjugation).

Number of α-hydrogens: CH3 = 0, CH3 CH2 = 3, (CH3)2 CH = 6, (CH3)3 C = 9

⇒ Order of stability: 3 > 2 > 1 > methyl

∴ The tert-butyl cation (CH3)3 C is the most stable.

Answer: (4)

AIPMT 2005

Keep practising — Organic Chemistry – Some Basic Principles and Techniques

2

Name of the compound given below is [figure]

  1. 4-ethyl-3-methyloctane
  2. 3-methyl-4-ethyloctane
  3. 2,3-diethylheptane
  4. 5-ethyl-6-methyloctane
AIPMT 2003
3

Which one of the following orders of acid strength is correct ?

  1. RCOOH > ROH > HOH > HC CH
  2. RCOOH > HOH > ROH > HC CH
  3. RCOOH > HOH > HC CH > ROH
  4. RCOOH > HC CH > HOH > ROH
AIPMT 2003
4

Which one of the following is a free-radical substitution reaction ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. CH3CHO + HCN CH3CH(OH)CN
AIPMT 2003
5

IUPAC name of the following is CH2=CH-CH2-CH2-C CH

  1. 1-hexyne-5-ene
  2. 1,5-hexenyne
  3. 1-hexene-5-yne
  4. 1,5-hexynene
AIPMT 2002
6

CH2- O \|C-CH3 and CH2= O |C-CH3 are

  1. resonating structures
  2. tautomers
  3. geometrical isomers
  4. optical isomers
AIPMT 2002
7

The incorrect IUPAC name is

  1. CH3- O \|C- CH3 |CH-CH3 2-methyl-3-butanone
  2. CH3- CH3 |CH- CH2CH3 |CH-CH3 2,3-dimethylpentane
  3. CH3-C CCH(CH3)2 4-methyl-2-pentyne
  4. CH3 Cl |CH Br |CHCH3 2-bromo-3-chlorobutane
AIPMT 2001
8

The correct acidic order of the following is [figure]

  1. I > II > III
  2. III > I > II
  3. II > III > I
  4. I > III > II
AIPMT 2001
9

Which is maximum stable?

  1. 1-Butene
  2. cis-2-Butene
  3. trans-2-Butene
  4. All have same stability.
AIPMT 2000
10

Polarisation in acrolein can be described as

  1. + CH2=CH- + CHO
  2. - CH2=CH- + CHO
  3. - CH2=CH-CH + O
  4. + CH2=CH-CH - O
AIPMT 2000

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