51.

The reaction in which phenol differs from alcohol is :

• it undergoes esterification with carboxylic acid

• it reacts with ammonia

• it forms yellow crystals of iodoform

• it liberates H₂ with Na metal

There are 20 naturally occurring amino acids. The maximum number of tripeptides that can be obtained is :

• 8000

• 6470

• 7465

• 5360

An example ofa sulphur containing amino acid is :

• lysine

• serine

• cysteine

• tyrosine

A compound A has a molecular formula C₂Cl₃OH. It reduces Fehling's solution and on oxidation, gives a monocarboxylic acid B. A can be obtained by the action of chlorine on ethyl alcohol. A is :

• chloroform

• chloral

• methyl chloride

• monochloroacetic acid

The reaction involved in the oil of winter green test is :

Salicylic acid   product

The product is treated with Na₂CO₃ solution. The missing reagent in the above reaction is :

• phenol

• NaOH

• ethanol

• methanol

Which of the following biomolecules contain non-transition metal ion ?

• Vitamin B₁₂

• Chlorophyll

• Haemoglobin

• Insulin

Three dimensional molecules with cross links are formed in the case of a :

• thermoplastic

• thermosetting plastic

• Both (a) and (b)

• None of these

Which of the following is not present in a nucleotide ?

• Cytosine

• Guanine

• Adenine

• Tyrosine

Antiseptic chloroxylenol is :

• 4-chloro-3,5-dimethyl phenol

• 3-chloro-4,5-dimethyl phenol

• 4-chioro-2,5-dimethyl phenol

• 5-chloro-3,4-dimethyl phenol

A diabetic person carries a packet or glucose with him always, because :

• glucose reduces the blood sugar level slowly

• glucose increases the blood sugar level slowly

• glucose reduces the blood sugar level

• glucose increases the blood sugar level almost instantaneously