Which among the following compound is not optically active?

A) 3-chloro-2-methyl pentane

B) 3- chloropentane

C) 2-chloropentane

D) 2-chloro-3-methyl pentane


 An element crystallises in a bcc lattice with cell edge of 500 pm. The density of the element is 7.5 g cm-3. How many atoms are present in 300g of metal?

A) $6.4\times 10 ^{23}$ atoms

B) $12.8\times 10 ^{23}$ atoms

C) $3.2\times 10 ^{23}$ atoms

D) $1.6\times 10 ^{23}$ atoms


 What is IUPAC name of hydroquinone?

A) Benzene-1,3,5-triol

B) Benzene-1,2-diol

C) Benzene-1,4-diol

D) Benzene-1,2,4-triol


 The equilibrium constant  for a reaction is 20. what is the value of  $\triangle G^{0}$ at 300 K ? (R=8 x 10-3 kJ)

A) 16.63 kJ/mol

B) -5.527 kJ/mol

C) -2.763 kJ/mol

D) -1.663 kJ/mol

E) None of these


An acyl chloride is hydrogenated over catalyst palladium on barium sulphate to form an aldehyde. This reaction  is called as

A) Wolff-Kishner reduction

B) Etard reaction

C) Rosenmund reduction

D) Stephen reaction