91.

Which of the following is a double base propellant ?

• Methyl nitrate and nitromethane

• Nitroglycerine and nitrocellulose

• Kerosine and alcohol

• Acrylic rubber and liquid N2O4

Which one of the following compounds is capable of existing in a mesa form?

• 2,4-dibromopentane

• 3,3-dibromopentane

• 4-bromo-2-pentanol

• 3-bromo-2-pentanol

Which of the following is not true of carbanions?

• The carbon carrying the charge has eight valence electrons

• They are formed by heterolytic fission

• They are paramagnetic

• The carbon carrying the charge is sp³ hybridised

The S_N1 reactivity of the following halides will be in the order

(i) (CH₃)₃CBr

(ii) (C₆H₅)₂CHBr

(iii) (C₆H₅)₂C(CH₃)Br

(iv) (CH₃)₂CHBr

(v) C₂H₅Br

• (iii) > (ii) > (i) > (iv) > (v)

• (v) > (iv) > (i) > (ii) > (iii)

• (ii) > (i) > (iii) > (v) > (iv)

• (v) > (i) > (ii) > (iv) > (iii)

Which of the following does not answer iodoform test?

• n-butyl alcohol

• sec-butyl alcohol

• Acetophenone

• Acetaldehyde

Aniline on treatment with NaNO₂ in HCl at 0°C followed by treatment with alkaline β-naphthol gives:

• a violet solution

• a red solution

• a green solution

• a blue precipitate

Wurtz's reaction involves the reduction of alkyl halide with :

• Zn/ HCl

• HI

• Zn/ Cu couple

• Na in ether

The compound that does not answer iodoform test is :

• ethanol

• ethanal

• methanol

• propanone

Best method of preparing alkyl chloride is

• ROH + SOCl₂ → 

• ROH + PCl₅ → 

• ROH + PCl₃ →

• ROH $+ \mathrm{HCl} \stackrel{\mathrm{Anhy}\hspace{0.17em}{\mathrm{ZnCl}}_2}{\to }$

Acetylene can be obtained by the reaction

• $\mathrm{HCOOK} \stackrel{\mathrm{Electrolysis}}{\to }$

• ${\mathrm{CHI}}_3 + \mathrm{Ag} \stackrel{∆}{\to }$

• ${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{OH} \underset{443\mathrm{K}}{\overset{\mathrm{Conc}. {\mathrm{H}}_2{\mathrm{SO}}_4}{\to }}$

• Be₂C + H₂O →