Organic Chemistry - MCQs test

The enolic form of ethyl acetoacetate as shown below has

• 9 sigma bonds and 2 pi-bonds

• 9 sigma bonds and 1 pi-bonds

• 18 sigma bonds and 2 pi-bonds

• 16 sigma bonds and 1 pi-bonds

The IUPAC name of the following compound is

• 4-methyl-3-ethylhex-4-ene

• 4, 4-diethyl-3-methylbut-2-ene

• 3-ethyl-4-methylhex-4-ene

• 4-ethyl-3-methylhex-2-ene

In the IUPAC system, PhCH₂CH₂CO₂H is named as

• 3-phenylpropanoic acid

• benzylacetic acid

• carboxyethyl benzene

• 2-phenylpropanoic acid

The order of stability of the following tautomeric compounds is

• II> I> III

• Il>Ill>I

• I>II>III

• III>II>I

The temporary effect in which there is complete transfer of a shared pair of pi-electrons to one of the atoms joined by a multiple bond on the demand of an attacking reagent is called

• inductive effect

• hyperconjugation effect

• positive resonance effect

• electromeric effec

: CCl₂ is

• an electrophile

• a nucleophile

• a free radical

• none of these

Which of the following species is not electrophilic in nature?

• cl+

• BH₃

• H₃0+

• +NO₂

The most unlikely representation of resonance structure of p-nitrophenoxide is

• a

• b

• c

• d

Hyperconjugation involves overlap of the following orbitals

• p - p

The effect that makes 2, 3-dimethyl-2-butene more stable than 2-butene is

• resonance

• hyperconjugation

• electromeric effect

• inductive effect