51.

Which of the following soap/detergent is least, reduce space biodegradable?

• CH₃ - (CH₂)₁₁ - OSO₂Na

• C₁₇H₃₅ - COONa

• 

• 

Buna-N, a synthetic rubber is copolymer of

• H₂C = CH - CH = CH₂ and H₅C₆ - CH = CH₂

• H₂C = CH - CN and H₂C = CH - CH = CH₂

• H₂C = CH - CCl = CH₂ and H₂C = CH - CH = CH₂

• H₂C = CN - CN and H₂C = CH - CCl = CH₂

When a mixture of 1-hexanol and hexanoic acid in diethyl ether is shaken with an aqueous NaHCO₃ solution, then which of the following is right distribution?

• In ether	In sodium bicarbonate solution
  Sodium hexanoate	1- hexanol

• 1- hexanol

  Hexanoic acid

• 1- hexanol

  Sodium hexanoate

• Hexanoic acid

  1- hexanol

The major product P will be

The product P of the given reaction is 

In the reaction 

C₇H₈ $\stackrel{3{\mathrm{Cl}}_2/ ∆}{\to }$ X $\stackrel{{\mathrm{Br}}_2/ \mathrm{Fe}}{\to }$ Y $\stackrel{\mathrm{Zn}/ \mathrm{HCl}}{\to }$ Z

Z is

• o-bromotoluene

• m-bromotoluene

• p-bromotoluene

• 3-bromo-2, 2, 6- trichlorotoluene

The molal freezing point depression constant for benzene (C₆H₆) is 4.90 K Kg mol^-1. Selenium exists as a polymer of the type Se_x. When 3.26 g of selenium is dissolved in 226 g of benzene, the observed freezing point is 0.112$°$C lower than that of pure benzene. The molecular formula of selenium is (atomic mass of Se = 78.8 g mol^-1).

• Se₈

• Se₆

• Se₄

• Se₂

X, Y and Z respectively are

Choose the correct alkyne and reagents for the preparation of

For carbanion

Stability order will be

• P > Q > S > R

• P > R > Q > S

• Q > R > S > R

• S > R > Q > P