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? (NA = 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
Which one of the following is not used as an initiator in ionic polymerisation?
NaNH2
SnCl2
AlCl3
(C6H5CO)2O2
What are X and Y in the following reactions?
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?
A.
Is added and generally used to impart antiseptic properties in soap.
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
The drug, which was designed to prevent the interaction of histamine with the receptors present in the stomach wall is
prontosil
cimetidine
aspartame
equanil