(+)-2-chloro-2-phenylethane in toluene racemises slowly in the presence of small amount of SbCl₂, due to the formation of

• carbanion

• carbene

• free-radical

• carbocation

Correct pair of compounds which gives blue colouration/precipitate and white precipitate, respectively, when their Lassaigne's test is separately done is

• NH₂NH₂, HCl and ClCH₂COOH

• NH₂CSNH₂ and PhCH₂Cl

• NH₂NH₂, COOH and NH₂CONH₂

• 

2-methylpropane on monochlorination under photochemical condition give

• 2-chloro-2-methylpropane as major product

• (1 : 1) mixture of 1-chloro-2-methylpropane and 2-chloro-2-methyl propane

• 1-chloro-2-methyl propane as a major product

• (1 : 9) mixture of 1-chloro-2-methylpropane and 2-chloro-2-methylpropane

The most likely protonation site in the following molecule is    

• C-1

• C-2

• C-3

• C-6

The optically active molecule is

An optically active compound having molecular formula C₂H₁₆ on ozonolysis gives acetone as one of the products. The structure of the compound is

Among the following statements about the molecules X and Y, the one(s) which correct is (are)

• X and Y are diastereomers

• X and Y are enantiomers

• X and Y are both aldohexoses

• Xis a D-sugar and Y is an L-sugar

The correct structure of the dipeptide gly-ala is

Amongst the following, the one which can exist in free state as stable compound is

• C₇H₉O

• C₈H₁₂O

• C₆H₁₂O

• C₁₀H₁₇O

Compound A treated with NaNH₂ followed by CH₃CH₂Br gave compound B. Partial hydrogenation of compound B produced compound C, which on ozonolysis gave a  carbonyl compound D, (C₃H₆O). Compound D did not respond to iodoform test with I₂/KI and NaOH. Find out the structures of A, B, C and D.