Problem: Zinc:

There are many important organozinc compounds. Organozinc chemistry is the science of organozinc compounds describing their physical properties, synthesis and reactions. Among important applications is the Frankland-Duppa Reaction in which an oxalate ester(ROCOCOOR) reacts with an alkyl halide R'X, zinc and hydrochloric acid to the α-hydroxycarboxylic esters RR'COHCOOR, the Reformatskii reaction which converts α-halo-esters and aldehydes to β-hydroxy-esters, the Simmons–Smith reaction in which the carbenoid (iodomethyl)zinc iodide reacts with alkene(or alkyne) and converts them to cyclopropane, the Addition reaction of organozinc compounds to carbonyl compounds. The Barbier reaction (1899) is the zinc equivalent of the magnesium Grignard reaction and is better of the two. In presence of just about any water the formation of the organomagnesium halide will fail, whereas the Barbier reaction can even take place in water. On the downside organozincs are much less nucleophilic than Grignards, are expensive and difficult to handle. Commercially available diorganozinc compounds are dimethylzinc, diethylzinc and diphenylzinc. In one study the active organozinc compound is obtained from much cheaper organobromine precursors:

What does organozinc chemisty describe?
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A: physical properties, synthesis and reactions.


Problem: Middle Ages:

Romanesque art, especially metalwork, was at its most sophisticated in Mosan art, in which distinct artistic personalities including Nicholas of Verdun (d. 1205) become apparent, and an almost classical style is seen in works such as a font at Liège, contrasting with the writhing animals of the exactly contemporary Gloucester Candlestick. Large illuminated bibles and psalters were the typical forms of luxury manuscripts, and wall-painting flourished in churches, often following a scheme with a Last Judgement on the west wall, a Christ in Majesty at the east end, and narrative biblical scenes down the nave, or in the best surviving example, at Saint-Savin-sur-Gartempe, on the barrel-vaulted roof.

Where are narrative biblical scenes painted in the church at Saint-Savin-sur-Gartempe?
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A: on the barrel-vaulted roof


Problem: Cyprus:

As soon as the Greek War of Independence broke out in 1821, several Greek Cypriots left for Greece to join the Greek forces. In response, the Ottoman governor of Cyprus arrested and executed 486 prominent Greek Cypriots, including the Archbishop of Cyprus, Kyprianos and four other bishops. In 1828, modern Greece's first president Ioannis Kapodistrias called for union of Cyprus with Greece, and numerous minor uprisings took place. Reaction to Ottoman misrule led to uprisings by both Greek and Turkish Cypriots, although none were successful. After centuries of neglect by the Turks, the unrelenting poverty of most of the people, and the ever-present tax collectors fuelled Greek nationalism, and by the 20th century idea of enosis, or union, with newly independent Greece was firmly rooted among Greek Cypriots.

How many Greek Cypriots were arrested and executed by the Ottoman governor of Cyprus?
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A: 486


Problem: Seattle:

From 1869 until 1982, Seattle was known as the "Queen City". Seattle's current official nickname is the "Emerald City", the result of a contest held in 1981; the reference is to the lush evergreen forests of the area. Seattle is also referred to informally as the "Gateway to Alaska" for being the nearest major city in the contiguous US to Alaska, "Rain City" for its frequent cloudy and rainy weather, and "Jet City" from the local influence of Boeing. The city has two official slogans or mottos: "The City of Flowers", meant to encourage the planting of flowers to beautify the city, and "The City of Goodwill", adopted prior to the 1990 Goodwill Games. Seattle residents are known as Seattleites.

Since Seattle is near Alaska, what is the city called?
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A:
Gateway to Alaska