Which of the following is the most stable compound?

• Ph₃$\stackrel{+}{\mathrm{C}}$

• Ph₂$\stackrel{+}{\mathrm{C}}$H

• Ph₂$\stackrel{+}{\mathrm{C}}$H₂

• Ph$\stackrel{+}{\mathrm{C}}$H₂

Detection of sulphur in sodium extract (Lassaigne test) is not done by which of the following reagents?

• Pb(OAc)₂

• Sodium nitroprusside

• Both Pb(OAc)₂ and Sodium nitroprusside

• Silver nitrate

Which of the following orders is not correct regarding the -I effect of the substituents?

• —SR < —OR <—O⁺R₂

• —N⁺R₂ < —OR<—F
  

• —I< —Cl <—Br < —F

• —N⁺R₃<—O⁺R₂ <—OR

Which of the following types of reaction occurs when a substituent has got a double bond with evenly distributed π-electron cloud?

• Electrophilic addition

• Nucleophilic addition

• Electrophilic substitution

• Nucleophilic substitution

An organic compound C₃H₅Cl (A) when treated with magnesium in dry ether gives (B) which on treating with CO₂ followed by acid hydrolysis gives C₄H₆O₂ (C). (C) is also obtained on oxidation of a hydrocarbon (D) C₈H₁₂. Structure of A is

• CH₂=CH-CH₂-Cl

• CH₂=C(Cl)-CH₃

• CH(Cl)=CH-CH₃

• 

A compound contains two dissimilar asymmetric C-atoms. The number of optical isomers is

• 1

• 2

• 4

• 8

Which of the following is the strongest nucleophile?

• OH^-

• CH₃O^-

• CH₃S^-

• C₂H₅O^-

298.

Which of the following compound is not aromatic?

• 1, 3-cyclobutadene

• Pyridine

• Furan

• Thiophene

The structure shows

• geometrical isomerism

• optical isomerism

• geometrical and optical isomerism

• tautomerism

What is the correct IUPAC name of

• 4-methoxy-2-nitrobenzaldehyde

• 4-formyl-3-nitroanisole

• 4-methoxy-6-nitrobenzaldehyde

• 2-formyl-5-methoxynitrobenzene