t-butyl 1852021907_c1.JPG can't give decarboxylation while normally $\alpha$-$\beta$  unsaturated acid give this reaction because

A) t-butyl gp. has large size and does not let the COOH group to leave

B) t-butyl gp. cannot extract H from COOH

C) t-butyl gp. stabilise carbanion formed

D) t-butyl gp. does not allow this composition to convert to $\beta-\gamma$ -unsaturated acid


Group 15 elements have more electrons gain enthalpy than group 16 -elements.The correct reason for this is

A) Half-filled stability of gp.15 elements

B) poor shielding in gp.15

C) poor shielding in gp.16

D) half-filled stability ogf gp.16 elements


 For a reaction A → B: $\triangle$ H =20kj mol-1 the activation energy of the forward reaction is 85kJ/mol. The activation energy of the backward reaction will be

A) 105 kJ/mol

B) 65 kJ/mol

C) 45 kJ/mol

D) 75 kJ/mol


One mole of an ideal gas at 300 k  is expanded isothermally from an initial volume of 1 litre to 10 litres. Then $\triangle$ S  (cal deg-1  mol-1) for this process is : (R=2 cal K-1 mol-1)

A) 7.12

B) 8.314

C) 4.6

D) 3.95


The protein Present in the hair is

A) Lysine

B) Myosine

C) Keratin

D) Alanine