Solution - Career Point

5. Dopamine of a drug used in the treatment ofparkinson's disease.NHHO CH 2 –CH 2COOHHODopaminWhich of the following statements about thiscompound are correct ?(A) It can exist in optically active forms.(B) One mole will react with three moles of sodiumhydroxide to form a salt(C) It can exist as a Zwitter ion in the aqueoussolution(D) It gives nitroso compound on treatment withHNO 2 .6. Which of the following method(s) would be usefulfor preparing ketones ?(A) Friedel-Crafts reaction of an acyl chloride withbenzene (AlCl 3 catalyst)(B) Reaction of methyllithium with the lithium salt ofcarboxylic acid, followed by hydrolysis(C) Reaction of R 2 CuLi with an acyl choride in etherat low temperature(D) Reaction of Grignard reagents with acyl chloridein ether followed by hydroylsis7. In the given table types of H bonds and some H bondenergies are given and other H bond energies are notgiven. You are to perdit the unknown H-bondenergies.Types of H-bonds H-bond energies in KJ/mol(I) F – H …….. O –F – H …….. F 30(II) O – H …….. O –O – H …….. F 15(III) F – H …….. F – –(IV) N – H …….. N –Correct prediction are –(A) H-bond energy for (I) may be 20 kJ/mol(B) H-bond energy for (II) may be 25 kJ/mol(C) H-bond energy for (III) may be 113 kJ/mol(D) H-bond energy for (IV) may be 12 kJ/mol8. During conductance measurement of an electrolytebased on the wheatstone bridge principle alternatingcurrent is used because direct current produces –(A) polymerisation(B) Ionisation(C) Electrolysis resulting in the chnge ofconcentration and in consequencae the resistance(D) Polarisation at the electrodes resulting in thechange of resistance9. Consider the cell :Ag | AgCl (s) | KCl (1M) | Hg 2 Cl 2 (s) | Hg (l) | Pt. Thecell potential :(A) increases on increasing concentration of Cl – ions(B) decreases on decreasing concentration of Cl – ions(C) is independent of concentration of Cl – ions(D) is independent of amounts of AgCl (s) andHg 2 Cl 2 (s)SECTION – IIIMatrix - Match TypeThis section contains 2 questions. Each questioncontains statements given in two columns, which haveto be matched. The statements in Column I are labeledA, B, C and D, while the statements in Column II arelabeled p, q, r, s and t. any given statement in Column Ican have correct matching with ONE OR MOREstatements (s) in column II. The appropriate bubbledcorresponding to the answers to these questions have tobe darkened as illustrated in the following example :If the correct matches are A – p, s and t; B – q and r;C – p and q; and D – s and t; then the correctdarkening of bubbles will look like the following.p q r s tABCDppqq10. Match the followingColumn IColumn II(A) HCOOH (p) Decarboxylationon heating(B) CH 3 COOH (q) Reation with Br 2(C)OHCOOH(r) Cu 2+ (alkaline)→Cu 2 O(D) PhCH 2 COOH11. Match the followingColumn I(A) XeO 4(B) XeF 4rrrsstt(s) Decarbonylation ordecarboxylation ontreatment withconc. H 2 SO 4(t) Reaction with I 2 +NaOHColumn II(p) Non polar(q) Having no lone pair ofelectron in the central atom(C) SO 3 (r) Planar(D) BF 3 (s) Having lone pair of(t)electrons in the central atomTetrahedralXtraEdge for IIT-JEE 63APRIL 2010