Assertion : Trans-2-butene on reaction with Br₂ gives meso-2,3-dibromobutane.

Reason : The reaction involves syn -addition of bromine.

• If both assertion and reason are true and the reason is the correct explanation of the assertion.

• If both assertion and reason are true and the reason is not the correct explanation of the assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

In a mixture, two enantiomers are found to be present in 85% and 15% respectively. The enantiomeric excess (ee) is

• 85%

• 15%

• 70%

• 60%

The IUPAC name of the compound having the formula CCl₃CH₂CHO is

• 2, 2, 2-trichloropropanal

• 1,1, 1-trichloropropanal

• 3, 3, 3-trichloropropanal

• 1, 2, 1-dichloromethanal

Best reagent for nuclear iodination of aromatic compounds is

• KI/ CH₃COCH₃

• I₂/CH₃CN

• KI/ CH₃COOH

• I₂ / HNO₃

785.

Identify the correct method for the synthesis of the compound shown below from the following alternatives.

• 

• 

• 

• 

Which one of the following methods are used to prepare Me₃COEt with good yield?

• Mixing EtONa with Me₂CCl

• Mixing Me₂CONa with EtCl

• Heating a mixture of (1:1) EtOH and Me₂COH in the presence of conc. H₂SO₄

• Treatment of Me₃COH with EtMgI

Under identical conditions, the SN₁ reaction will occur most efficiently with:

• tert-butyl chloride

• 1-chlorobutane

• 2-methyl-1-chloropropane

• 2-chlorobutane

Identify the method by which Me₃CCO₂H can be prepared:

• Treating 1 mole of MeCOMe with 2 moles of MeMgl

• Treating 1 mole of MeCO₃Me with 3 moles of MeMgI

• Treating 1 mole of MeCHO with 3 moles of MeMgl

• Treating 1 mole of dry ice with 1 mol of MeCMgI

The correct statement regarding the following compounds is

• all three compounds are chiral

• only I and II are chiral

• I and III are diastereomers

• only I and III are chiral

The ease of dehydrohalogenation of alkyl halide with alcoholic KOH is:

• 3° < 2° < 1°

• 3° > 2° > 1 °

• 3° < 2° > 1°

• 3° > 2° < 1 °