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VITEEE 2015 :: Chemistry :: General questions




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1.

Which of the following reactions is used to prepare isobutane?


A) Wurtz reaction of $C_{2}H_{5} Br$

B) Hydrolysis of n-butylmagnesium iodide

C) Reduction of propanol with red phosphorus and HI

D) Decarboxylation of 3-methylbutanoic acid



2.

Identify Z in the following reaction  sequence

2752021815_v1.JPG


A) $CH_{3}-CH(NH_{2})-CN_{2}NH_{2}$

B) $CH_{3}-CHOH-CH_{2}OH$

C) $CH_{3}-C(OH)=CH_{2}$

D) $CH_{3}-C\equiv CH_{}$



3.

In  the cannizzaro  reaction given below 

$2Ph-CHO$   $\underrightarrow{OH^{-}}$   $ Ph-CH_{2}-OH+PhCO_{2}^{-}$

 the slowest step is 


A) the attack of $O^{-}H$ at the carbonyl group

B) the transfer of hydride ion to the carbonyl group

C) the abstraction of a proton from the carboxylic acid

D) the deprotonation of Pb- $CH_{2}OH$



4.

2552021757_c7.JPG

X and Y respectively are 


A) picric acid 2.4,6- tribromophenol

B) 5- nitrophenol acid , 5-bromosalicylic acid

C) 0-nitrophenol , O-bromophenol

D) 3,5-dinitrosalicylic acid, 3,5-dibromosalicylic acid



5.

Super glue or crazy glue is 


A) poly (methyl methacrylate)

B) poly (ethyl acrylate)

C) poly( merthyl $\alpha$- cyanoacrylate)

D) poly (ethyl-methacrylate)



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