Each polypeptide in protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be- (a) primary structure of proteins. (b) secondary structure of proteins. (c) tertiary structure of proteins. (d) quaternary structure of proteins.

Fructose contains functional group- (a) Aldehyde (b) Ketone (c) Carboxylic acid (d) primary amine

RNA and DNA are chiral molecules. Their chirality is due to : (a) Chiral bases (b) Chiral phosphate ester units (c) D-sugar component (d) L-sugar component.

The anomeric carbon in D(+) glucose is – (a) C-1 carbon (b) C-2 carbon (c) C-5 carbon (d) C-6 carbon

The functional group which is found in amino acid is- (a)-COOH (b) -\(NH_2\) (c) -\(CH_3\) (d) both (a) and (b)

The letter ‘D’ in carbohydrates signifies- (a) dextrorotatory (b) configuration (c) diamagnetic nature (d) mode of synthesis

The reason for double helical structure of DNA is operation of- (a) electrostatic attractions (b) dipole-dipole interaction (c) van der Waal’s forces (d) hydrogen bonding

Which base is present in RNA but not in DNA? (a) Uracil (b) Cytosine (c) Guanine (d) Thymine

Which of the following factors is not responsible for the denaturation of proteins? (a) Heat (b) Charge (c) pH change (d) Organic solvents

Which statement is incorrect about peptide bond? (a) C-N bond length in proteins is longer than usual bond length of C-N bond. (b) Spectroscopic analysis shows planar structure of -CO-NH- group (c) C-N bond length in proteins is smaller than usual bond length of C-N bond (d) None of the above

Propanone on reaction with alkyl magnesium bromide followed by hydrolysis will produce (a) primary alcohol (b) secondary alcohol (c) tertiary alcohol (d) carboxylic acid

Acid catalysed dehydration of t-butanol is faster than that of n-butanol because (a) tertiary carbocation is more stable than primary carbocation. (b) primary carbocation is more stable than tertiary carbocation. (c) t-butanol has a higher boiling point. (d) rearrangement takes place during dehydration of t- butanol.

An alcohol X when treated with hot conc. \(H_2\)\(SO_4\) gave an alkene Y with formula \(C_4\)\(H_8\). This alkene on ozonolysis gives single product with molecular formula \(C_2\)\(H_4\)O. The alcohol is (a) butan-1-ol. (b) butan-2-ol. (c) 2-methylpropan-1-ol. (d) 2,2-dimethylbutynal-1-oI.

An unknown alcohol is treated with “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism? (a) Tertiary alcohol by SN2. (b) Secondary alcohol by SN1. (c) Tertiary alcohol by SN1. (d) Secondary alcohol by SN2.

The decreasing order of boiling point of the following alcohols is (a) 3-methylbuan-2-ol > 2-methylbutan-2-ol > pentan-1-ol. (b) Pentan-1-ol > 3-methylbutan-2-ol > 2-methylbutan-2-ol. (c) 2-methylbutan-2-ol > 3-methylbutan-2-ol > pentan-1-ol. (d) 2-methylbutan-2-ol > pental-1-ol > 3-methylbutan-2-ol.