The use of CCl₄ as fire extinguisher depends on the fact that :

• it is an inorganic compound

• it is an organic compound

• its vapour is much heavier than air and non-combustible

• it is a compound of chlorine

Tertiary alkyl halides are practically inert towards substitution by S_N2 mechanism because of :

• steric hindrance

• inductive effect

• instability

• insolubility

263.

Chloroform , on exposing to air and sunlight produce :

• chloropicrin

• phosgene

• carbon tetrachloride

• benzene

Which of the following does not give nitroalkane?

• CH₃-N(CH₃)-CH₃ $\stackrel{{\mathrm{KMnO}}_4}{\to }$

• C₂H₅I $\stackrel{\mathrm{alc}. {\mathrm{AgNO}}_2}{\to }$

• CH₃ - CH₃ $\stackrel{\mathrm{Fuming} {\mathrm{HNO}}_3}{\to }$

• Both (a) and (b)

Which of the following is true for an ideal solution?

• $∆$H_(mix) = 0

• $∆$S_(mix) = 0

• $∆$G_(mix) = 0

• None of these

Boiling point of benzene is 353.23 K. When 1.8 g of non-volatile solute is dissolved in 90 g of benzene. Then boiling point is raised to 354.11 K. Given K_b (benzene) = 2.5 kg mol^-1. The molecular mass of non-volatile substance is

• 58 g mol^-1

• 120 g mol^-1

• 116 g mol^-1

• 60 g mol^-1

But-1-ene $\underset{{\mathrm{H}}_3\mathrm{O}}{\overset{({\mathrm{CH}}_3\mathrm{COO}{)}_2}{\to }}?$

The product in the above reaction is

• CH₃CH₂CH₂CH₂OH

• CH₃CH₂CH(OH)CH₃

• CH₂=CH₂CH(OH)-CH₃

• CH₃-CH=C(OH)-CH₃

Assertion : Aryl sulphunic acid gives phenol or reacting with NaOH at high temperature.

Reason : This reaction is electrophilic substitution reaction.

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

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

Assertion: HC= C^- is more stable than H₂C $\equiv$CH^-
Reason : HC$\equiv$ C^- has more s-character than HC= CH^-

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

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

• If assertion is true but reason is false.

• If both assertion and reason are false.

Which of the following reaction follows S_N1 mechanism ?

• (CH₃)₂C-CH₂Cl + CH₂OK

• (CH₃)₂C-CH₂Cl + HCl

• (CH₃)₃C-Cl + NaOH

• (CH₃)₂CHI + H₂O