31.

Which of the following biphenyls is optically active?

• 
• 
• 
• 

The correct statement regarding the basicity of arylamines is

• Arylamines are generally more basic than alkylamines because the nitrogen lone pair electrons are not delocalized by interaction with the aromatic ring pi-electron system

• Arylamines are generally more basic than alkylamines, because of aryl group

• Arylamines are generally more basic than alkylamines because the nitrogen atom in arylamines is sp-hydridized.

• Arylamines are generally more basic than alkylamines because the nitrogen atom in arylamines is sp-hydridized.

For the following reactions,

i) CH₃ CH₂ CH₂Br + KOH --> CH₃CH=CH₂ +KBr +H₂O

ii)  


iii) 

• (i) is elimination reaction, (ii) is substitution reaction, and (iii) is addition reaction.

• (i) is elimination reaction, (ii) is addition reaction, (iii) is substitution reactions.

• (i) is substitution, (ii) addition reaction (iii) is addition reactions

• (i) is substitution, (ii) addition reaction (iii) is addition reactions

The reaction


Can be classified as

• Alcohol formation reaction

• Dehydration reaction

• Williamson alcohol synthesis reaction

• Williamson alcohol synthesis reaction

The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha -carbon, is

• a carbonyl compound with a hydrogen atom on its alpha -carbon rapidly equilibrates with its corresponding enol and this process is known as aldehyde-ketone equilibration.

• a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as carbonylation

• a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism

• a carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its corresponding enol and this process is known as keto-enol tautomerism

In a protein molecule various amino acids are linked together by

• β-glycosidic bond

• peptide bond

• dative bond

• dative bond

Which of the following is an analgesic?

• Penicillin

• Streptomycin

• Chloromycetin

• Chloromycetin

Natural rubber has

• All trans-configuration

• Alternate cis and trans configuration

• Random cis and trans configuration

• Random cis and trans configuration

Which of the following reagents would distinguish cis-cyclopenta-1-,2-diol from the trans isomer?

• Ozone

• MnO₂

• Aluminium isopropoxide

• Aluminium isopropoxide

Which of the following statement is false?

• Ca²⁺ ions are important in blood clotting

• Ca²⁺ ions are not important in maintaining the regular beating of the heart.

• Mg²⁺ ions are important in the green parts of plants

• Mg²⁺ ions are important in the green parts of plants