An element has a body centered cubic structure with a unit cell edge length of 400 pm. Atomic mass of an element is 24 g mol^-1. What is the ·density of the element? (N_A = 6 × 10²³ mol^-1)

• 2.50 g cm^-3

• 1.80 g cm^-3

• 3.60 g cm^-3

• 1.25g cm^-3

Which one of the following is more reactive towards SN₂ reaction ?

• (CH₃)₃CX

• (CH₃)₂CHX

• CH₃CH₂X

• CH₃X

What are X and Y in the following reactions?

Which one of the following is not used as an initiator in ionic polymerisation?

• NaNH₂

• SnCl₂

• AlCl₃

• (C₆H₅CO)₂O₂

What is Z in the followmg sequence of reactions?

• —CO—CH₃

• —CO—Cl

• —CH₃

• —CH₂—CH₃

What are X and Y in the following reactions?

$$\begin{gathered} {\mathrm{CH}}_2\mathrm{O} \underset{\left(\mathrm{ii}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right) \mathrm{X}}{\to }} {\mathrm{CH}}_3({\mathrm{CH}}_2{)}_2{\mathrm{CH}}_2\mathrm{OH} \\ \mathrm{Y} \underset{\left(\mathrm{ii}\right) {\mathrm{H}}_3{\mathrm{O}}^{+}}{\overset{\left(\mathrm{i}\right) {\mathrm{C}}_2{\mathrm{H}}_5\mathrm{MgBr}}{\to }} {\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{C}({\mathrm{CH}}_3{)}_2\mathrm{OH} \end{gathered}$$

• X	Y
  CH3-CH(CH3)-MgBr	C2H5COCH3

• X	Y
  CH3CH2CH2MgBr	CH3-CO-CH3

• X	Y
  (CH3)3CMgBr	CH3-CO-CH3

• X	Y
  CH3-CH2-MgBr	CH3CH2CHO

Which of the following structure represents the compound, generally added to soaps to impart antiseptic properties?

The increasing order of acidity of the following carboxylic acids is

  I          II          III       IV

• III < IV < II < I

• II < III < II < I

• I < II < IV < III

• III < IV < I < II

Identify the statement which is not correct from the following.

(i)Carbohydrates are stored as glycogen in animals.

(ii) In glycylalanine, CO of peptide bond belongs to alanine.

(iii) Base - sugar- phosphate unit is known as nucleoside.

(iv) Obesity is due to hypothyroidism.

The correct answer is:

• i, iv

• ii, iii, iv

• i, iii, iv

• ii, iii

40.

The drug, which was designed to prevent the interaction of histamine with the receptors present in the stomach wall is

• prontosil

• cimetidine

• aspartame

• equanil