371.

Which of the following statements is not correct?

• The six carbons in benzene are sp² hybridised.

• Benzene has (4n + 2) Π electrons.

• Benzene undergoes substitution reactions

• Benzene has two carbon-carbon bond lengths, 1.54 Å and 1.34 Å.

The chlorination of ethane is an example for which type of the following reactions ?

• Nucleophilic substitution

• Electrophilic substitution

• Free radical substitution

• Rearrangement

C₂H₆ $\stackrel{450°\mathrm{C}}{\to }$ C₂H₄ + H₂

Above reaction is known as

• combustion

• rearrangement

• pyrolysis

• cleavage

Which one of the following gives sooty flame on combustion?

• C₂H₄

• CH₄

• C₂H₆

• C₆H₆

What is Z in the following reaction?

${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{CO}}_2^{⊝}{\mathrm{Na}}^{\oplus }\stackrel{\mathrm{NaOH}/\mathrm{CaO}}{\to } \mathrm{Z}$

• propane

• n-butane

• ethane

• ethyne

Which of the following reagent is used to find out carbon-carbon multiple bonds?

• Grignard reagent

• Baeyer's reagent

• Sandmeyer's reagent

• Gatermann reagent

Which one of the following is more readily hydrolysed by S_N1 mechanism?

• (C₆H₅)₂C(CH₃)Br

• C₆H₅CH₂Br

• C₆H₅CH(CH₃)Br

• (C₆H₅)₂CHBr

Which of the following belongs to the homologous series of C₅H₈O₂N?

• C₆H₁₀O₃N

• C₆H₈O₂N₂

• C₆H₁₀O₂N₂

• C₆H₁₀O₂N

Identify the statement which is not correct?

• Dehydrobrominaton of 2-bromopentane gives pent-1-ene as the major product

• Freon 12 is manufactured by Swarts reaction

• CHCl₃ is stored in closed, dark coloured bottles

• Chronic exposure to CHCl₃ causes liver damage

In the combustion of 2.0 g of methane, 25 kcal heat is liberated, heat of combustion of methane would be

• 100 kcal

• 200 kcal

• 300 kcal

• 400 kcal