51.

N₂ gas is liberated when [HCl + NaNO₂] reacts with the following compound :

(A) CH₃CH₂NH₂   (B) Urea

(C) CH₃CONH₂    (D) C₆H₅NH₂

The answer is :

• A , B , C

• A , B , D

• A, C , D

• B , C , D

The main constituent of most natural fibres is :

• starch

• glycol

• cellulose

• caprolactum

d(+) lactic acid is obtained from :

• fermentation of cane sugar

• green vegetables

• muscles

• fermentation of milk sugar

Methyl isocyanide on hydrolysis gives :

• CH₃NH₂

• HCOOH

• CH₃COOH

• Both (a) and (b)

With CH₃MgBr , diethyl ether gives :

• coordination complex

• n - butane

• a mixture of ethyl bromide and methyl bromide

• propane

Acetamide when heated with PCl₅ gives :

• CH₃Cl

• CH₃CN

• CH₃CCl₂NH₂

• CHCl₂CONH₂

The type of bond that is most important in maintaining secondary structure of a protein is :

• disulphide bridges

• hydrogen bonding within the backbone

• hydrogen bonding between R group

• salt bridges

The angle $\angle$R-O-R is :

• 109° 28^°

• 95°

• 110°

• 105°

Which of the following is added to food for the flavour of meat ?

• Sodium benzoate

• Sodium lactate

• Sodium citrate

• Sodium glutamate

RNO₂ is reduced with Sn/HCl .Product formed is :

• RNHOH

• RNH₂

• RNH₃⁺

• R₂NH