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Hydrocarbons

NEET 2016 (Phase 2)MCQEasy📈 Topic in 12% papers+4−1
Ques. 1NEET 2016 (Phase 2)

Which of the following compounds shall not produce propene by reaction with HBr followed by elimination or direct only elimination reaction ?

  1. [figure]
  2. H3C- H2 |C-CH2OH
  3. H2C=C=O
  4. H3C- H2 |C-CH2Br

Answer

(3) H2C=C=O

Solution

(1) Cyclopropane + HBr ⇒ ring opening ⇒ CH3CH2CH2Br alc. KOH CH3CH=CH2

(2) CH3CH2CH2OH conc. H2SO4, CH3CH=CH2 + H2O (direct elimination)

(4) CH3CH2CH2Br alc. KOH CH3CH=CH2 + HBr (direct elimination)

(3) H2C=C=O (ketene) has only two carbon atoms ⇒ cannot give propene (C3H6).

Answer: (3)

Keep practising — Hydrocarbons

Ques. 2NEET 2016 (Phase 2)

In the given reaction, [figure] the product P is

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 3NEET 2016 (Phase 2)

The compound that will react most readily with gaseous bromine has the formula

  1. C3H6
  2. C2H2
  3. C4H10
  4. C2H4
Ques. 4AIPMT 2015

In the reaction with HCl, an alkene reacts in accordance with the Markovnikov's rule to give a product 1-chloro-1-methylcyclohexane. The possible alkene is

  1. [figure] (A)
  2. [figure] (B)
  3. (A) and (B)
  4. [figure]
Ques. 5AIPMT 2015

2,3-Dimethyl-2-butene can be prepared by heating which of the following compounds with a strong acid?

  1. (CH3)3CCH=CH2
  2. (CH3)2C=CHCH2CH3
  3. (CH3)2CHCH2CH=CH2
  4. (CH3)2CH- CH3 |CH-CH=CH2
Ques. 6AIPMT 2015

The oxidation of benzene by V2O5 in the presence of air produces

  1. maleic anhydride
  2. benzoic acid
  3. benzaldehyde
  4. benzoic anhydride.
Ques. 7AIPMT 2015 (Cancelled)

A single compound of the structure, [figure] is obtainable from ozonolysis of which of the following cyclic compounds?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 8AIPMT 2015 (Cancelled)

The reaction of C6H5CH=CHCH3 with HBr produces

  1. C6H5CH2CH2CH2Br
  2. [figure]
  3. C6H5 Br |CHCH2CH3
  4. C6H5CH2 Br |CHCH3
Ques. 9AIPMT 2014

What products are formed when the following compound is treated with Br2 in the presence of FeBr3? [figure]

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
Ques. 10NEET 2013

Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating ?

  1. -COOH
  2. -NO2
  3. -C N
  4. -SO3H
Ques. 11NEET 2013

Which of the following compounds will not undergo Friedel-Crafts reaction easily?

  1. Nitrobenzene
  2. Toluene
  3. Cumene
  4. Xylene

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