Question

UUT A 6. Which of the following is a B-diester? B) 0 0 A) C) - Corbin (Clell w.section 17.1 E) оо CH3OCCH2COCH 3 снҙссH2ccH3 CH3CCH2COCH3 Сн зососH 3 сн зосос 7. Which compound has the lowest pKa? A) (CH3CH2O2C)2CH2 B) CH3CH2O2CCH2CHO D) PhCOCH2COCH3 E) (NC)2CH2 Section: 17-1 C) CH3CH2COCH2CHO Section: 17-1 8. Which compound's a H is the least acidic? A) nitroethane B) propanenitrile D) propanal E) acetone C) N,N-dimethylacetamide

Answer 1

6. ester group is -COOR, so di-ester means two ester groups.

7. lowest pKa means higher the acidity. -CN is highest electron withdrawing group (deactivating group), so that it can stabilize negative charge on carbon. So Dicyanomethane ( CH₂(CN)₂ ) will have lowest pKa.

8. order: aldehyde < ketone < amide < ester < acid < acyl halide

Most Activating -ö: -NR2 - NH2 Strongly Activating OH -ÖR Activating Moderately Activating EDG ortho/para directing Weakly Activating -C CR2 Reference -H Weakly Deactivating X CH CR Moderately Deactivating EWG -COR Deactivating -COH meta directing -CC -CF3 CEN Strongly Deactivating OH -N- Most Deactivating +

-Cen bn lelel wieSy 6. Which of the following is a B-diester? A) Section: 17-1 В) C) D) E) 11 CHзососнз CH30CCH2COCH3 CH3CCH2CCH3 CH3CCH2COCH3 CH30COC 7. Which compound has the lowest pKa? A) (CH3CH202C)2CH2 Section: 17-1 B) CH3CH2O2CCH2CHO E) (NC)2CH2 С) СН3СH2COCH2CHO D) PHCOCH2COCH3 Section: 17-1 8. Which compound's a H is the least acidic? A) nitroethane D) propanal C) N.N-dimethylacetamide B) propanenitrile E) acetone

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