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STUDENT OF MARWARI COLLEGE RANCHI ROLL NO IS 20MCRMS520011

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PREPARATION OF CINNAMIC ACID FROM BENZALDEHYDE

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CINNAMC ACID IS AN  α , β  UNSATURATED CARBOXYLIC ACID WHICH IS PREPARED BY INTERACTION BETWEEN BENZALDEHYDE AND ACETIC ANHYDRYDE IN PRESENCE OF BASIC CATALYST LIKE POTASIUM ACETATE REACTION:

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1.DOUBLE NECKED ROUND BOTTEMED FLASK 2.BEAKER 3.MEASURING CYLINDER

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1.BENZALDEHYDE 2.POTASIUM ACETATE 3.ACETIC ANHYDRIDE 4.SODIUM CARBONATE

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5ml BENZALDEHYDE+8.2ml AC 2  O +7g K 2 CO 3.  R.B.F CONNECT WITH A REFLEX CONDENSE HEAT(HEAT 100°C) FOAMING WILL OCCURS ONCE THE FOAMIG DISAPEARS INCREASED THE 170°-180° AND BOIL 90 MIN. COOL THE MIX AND ADD 40ml H 2 O +10%NaOH TILL IT BECOME BASIC. ADD 25ml OF METHYL ETHER TWO LAYER ARE FORMED.

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AQUAS LAYER+CONC.HCL→CRYSTAL   OF   ACID→DRY AND WEIGHT→DETERMINATION OF M.P(133°C)

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d C 6 H-CHO=1.04g/m³                   m=d x v=1.04g/cm³x5cm³=5.2g 106g BENZALDIHYDE PRODUCES 132g CINNAMIC ACID 106g “ “        “       “             “      132/106g 5.2g “            “        “             “132x5.2/106=6.47g                                                     cinnamic  acid. Theoretical yield=6.47g Actual yield=4.24g %yield=Actual/theoretical yield x100=65.5%.

Myself nikesh kumar singh

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