71.

Which carbocation is most stable ?

• CH₃CH${}_2^{+}$

• C${\mathrm{H}}_3^{+}$

• C₆H₅C${\mathrm{H}}_2^{+}$

• CH₃CH₂C${\mathrm{H}}_2^{+}$

CH₃C(CH₂CH₃) = CH(CH₃) $\underset{{\mathrm{H}}_2}{\overset{\mathrm{catalyst}}{\to }}$ X. No. of optical isomer possible will be

• 2

• 4

• 0

• 3

Which of the following is the correct increasing order of stability of free radicals.

• (CH₃)₂CH⁰ < (CH₃)₂CH⁰ < (C₆H₅)₂⁰CH < (C₆H₅)₃C⁰

• (CH₃)₂CH⁰ < (CH₃)₂C⁰ < (C₆H₅)₃⁰C < (C₆H₅)₂C⁰

• (C₆H₅)₃⁰C < (C₆H₅)₂⁰CH < (CH₃)₃⁰C < (CH₃)₂⁰CH

• (C₆H₅)₂⁰CH < (C₆H₅)₂C⁰ < (CH₃)₃⁰C < (CH₃)₂⁰CH

Most acidic is

• CH₃COOH

• C₆H₅CH₂COOH

• HCOOH

• CH₃CH₂COOH

The number of enantiomers and mesa forms for the compound , 

HOOC-CH(CH₃)-CHOH-CHBr-CHOHCH(CH₃)-COOH are respectively:

• 12 , 2

• 12 , 4

• 8 , 4

• 8 , 2

Which of the following yields as a major product is mono chlorination of ethyl benzene in the presence of light and heat.

• m- chlorotoluene

• a mixture of -O- and p-chlorotoluene

• 1-chloro-2- phenylethane

• 1-chloro -1- phenyl ethane

The correct IUPAC name of

• 4-methyoxy -2- nitrobenzaldehyde

• 4-formyl -3- nitro anisole

• 4- methoxy -6- nitrobenzaldehyde

• 2-formyl -5- methoxy nitrobenzene

The correct order of stability of carbocations, is :

• 1$°$ < 2$°$ < 3$°$ < CH₃

• $\stackrel{+}{\mathrm{C}}$H₃ < 1$°$ < 2$°$ < 3$°$

• 3$°$ < 2$°$ < 1$°$ < $\stackrel{+}{\mathrm{C}}$H₃

• 2$°$ < 3$°$ < 1$°$ < $\stackrel{+}{\mathrm{C}}$H₃

The IUPAC name of the following compound is

• bicyclo [2, 2, 0] octane

• bicyclo [0, 2, 2] hexane

• bicyclo [2, 1, 1] hexane

• bicyclo [2, 2, 0] hexane

The following compound can not exhibit

CH₃CH = CH - CH(OH).COOH

• geometrical isomerism

• optical isomerism

• metamerism

• position isomerism