What is the product of the following reaction? (A) pentane (B) E-2-pentene (C) Z

Question

What is the product of the following reaction? (A) pentane (B) E-2-pentene (C) Z-2-pentene (D) 1-pentene Which of the following compounds will react fastest in an Sn2 reaction with NaCN? (A) 1-iodopropane (B) 2-bromopentane (C) 1-chloropropane (D) t-butyl bromide What is the expected product of the following reaction? What is the correct sequence of reactions to synthesize the following alcohol from 1-ethylcyclopentene? (A) reaction with Br_2, followed by reaction with D_2O (B) reaction with water/sulfuric acid (catalyst), followed by reaction with D_3O^+. (C) reaction with BD_3, followed by reaction with H_2O_2 and NaOH. (D) reaction with D_2O in presence of an acid catalyst

Explanation / Answer

(5)

(C) Z - 2 - Pentene

Hydrogenation of alkynes in the presence of Lindlar's catalyst forms the cis - alkene (or) Z-alkene.

(6)

(A) 1 - Iodopentane reacts faster with NaCN in SN2 reaction.

Because SN2 mechanism is a concerted reaction mechanism where cleavage of bond and formation of new bond occurs simultaneously. Hence less hindered carbon is suitably attacked.

Amond halogens leaving ability is in the order of, I > Br > Cl > F

(7)

(A)

(8)

(C)

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