IIT-JEE-Chemistry-Final Revision Set No.47

1. A positive carbylamines test is given by :
(A) N, N–dimethylaniline (B) 2, 4–dimethylaniline
(C) N-methyl-o-methylaniline (D) p-methylbenzylamine

2. The optically active tartaric acid is named as D – (+) – tartaric acid because it has a positive :
(A) optical rotation and is derived from D-glucose
(B) pH in organic solvent
(C) optical rotation and is derived from D – (+) – glyceraldehyde
(D) optical rotation only when substituted by deuterium

3. A solution of (+) –2–chloro–2–phenylethane in toluene racemises slowly in the presence of small amount of SbCl5, due to the formation of:
(A) free-radical (B) carbine
(C) carbanion (D) carbocation

4. How many millilitres of 0.5 M H2SO4 are needed to dissolve 0.5 g of copper (II) carbonate?

5. Give reasons for the following in one or two sentences only.
(i) BeCI2 can be easily hydrolysed.
(ii) CrO3 is an acid anhydride.

Source 1999 JEE