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Hydrocarbons

JEE Main 2024 (Online) 1st February Evening ShiftMCQEasy📈 Topic in 20% papers+4−1
Ques. 1JEE Main 2024, 1 February (Evening Shift)

The set of meta directing functional groups from the following sets is :

  1. -CN, -NH2, -NHR, -OCH3
  2. -CN, -CHO, -NHCOCH3, -COOR
  3. -NO2, -NH2, -COOH, -COOR
  4. -NO2, -CHO, -SO3H, -COR

Answer

(4) -NO2, -CHO, -SO3H, -COR

Solution

Meta directors are −R groups: the ring atom is multiply bonded to a more electronegative atom (-NO2, -CN, -CHO, -COR, -COOH, -COOR, -SO3H); groups with a lone pair on the attached atom (-NH2, -NHR, -OCH3, -NHCOCH3) are +R, o/p directors.

(A): -NH2, -NHR, -OCH3 are o/p ⇒ (A) is not a meta set

(B): -NHCOCH3 is o/p ⇒ (B) is not a meta set

(C): -NH2 is o/p ⇒ (C) is not a meta set

(D): -NO2, -CHO, -SO3H, -COR are all −R ⇒ (D) is the meta set

Answer: (4)

Keep practising — Hydrocarbons

Ques. 2JEE Main 2024, 31 January (Morning Shift)

Number of alkanes obtained on electrolysis of a mixture of CH3COONa and C2H5COONa is .

Ques. 3JEE Main 2024, 31 January (Evening Shift)

Major product of the following reaction is - [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 4JEE Main 2024, 31 January (Evening Shift)

The correct order of reactivity in electrophilic substitution reaction of the following compounds is : [figure]

  1. B > C > A > D
  2. B > A > C > D
  3. D > C > B > A
  4. A > B > C > D
Ques. 5JEE Main 2024, 31 January (Evening Shift)

Number of isomeric products formed by monochlorination of 2-methylbutane in presence of sunlight is .

Ques. 6JEE Main 2024, 30 January (Morning Shift)

Compound A formed in the following reaction reacts with B to give the product C. Find out A and B. CH3-C CH + Na A B CH3- (C)C C-CH2- CH3 |CH2 + NaBr

  1. A = CH3-C -C Na+, B = CH3-CH2-CH2-Br
  2. A = CH3-CH=CH2, B = CH3-CH2-CH2-Br
  3. A = CH3-C -C Na+, B = CH3-CH2-CH3
  4. A = CH3-CH2-CH3, B = CH3-C CH
Ques. 7JEE Main 2024, 29 January (Morning Shift)

Identify product A and product B : [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8JEE Main 2024, 29 January (Morning Shift)

[figure] Consider the given reaction. The total number of oxygen atom/s present per molecule of the product (P) is .

Ques. 9JEE Main 2024, 29 January (Evening Shift)

Which of the following reaction is correct?

  1. C2H5CONH2 + Br2 + NaOH C2H5CH2NH2 + Na2CO3 + NaBr + H2O
  2. [figure]
  3. [figure]
  4. CH3CH2CH2NH2 [H2O]HNO2, 0 C CH3CH2OH + N2 + HCl
Ques. 10JEE Main 2024, 27 January (Morning Shift)

Among the following, total number of meta directing functional groups is (Integer based) -OCH3, -NO2, -CN, -CH3, -NHCOCH3, -COR, -OH, -COOH, -Cl

Ques. 11JEE Main 2024, 27 January (Evening Shift)

The incorrect statement regarding conformations of ethane is :

  1. The dihedral angle in staggered conformation is 60 .
  2. Ethane has infinite number of conformations.
  3. Eclipsed conformation is the most stable conformation.
  4. The conformations of ethane are inter-convertible to one-another.

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