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The Urdu alphabet (Urdu: اُردُو حُرُوفِ تَہَجِّی, romanized: urdū ḥurūf-i tahajjī) is the right-to-left alphabet used for writing Urdu.It is a modification of the Persian alphabet, which itself is derived from the Arabic script.
Download as PDF; Printable version; In other projects Wiktionary; Wikidata item; ... Pages in category "Urdu letters" The following 36 pages are in this category, out ...
A 3D model of ethyne , the simplest alkyne. In organic chemistry, an alkyne is an unsaturated hydrocarbon containing at least one carbon—carbon triple bond. [1] The simplest acyclic alkynes with only one triple bond and no other functional groups form a homologous series with the general chemical formula C n H 2n−2.
العربية; বাংলা; Беларуская (тарашкевіца) Български; Bosanski; Català; Čeština; Dansk; Deutsch; Eesti; Ελληνικά
[citation needed] It is published by the Urdu Lughat Board, Karachi. The dictionary was edited by the honorary director general of the board Maulvi Abdul Haq who had already been working on an Urdu dictionary since the establishment of the Urdu Dictionary Board, Karachi, in 1958. [1] [2] [3] Urdu Lughat consists of 22 volumes. In 2019, the ...
Using various techniques, polyynes H(−C≡C−) n H with n up to 4 or 5 were synthesized during the 1950s. [12] Around 1971, T. R. Johnson and D. R. M. Walton developed the use of end-caps of the form – SiR 3, where R was usually an ethyl group, to protect the polyyne chain during the chain-doubling reaction using Hay's catalyst (a copper(I)–TMEDA complex).
Shahmukhi (Shahmukhi: شاہ مُکھی, pronounced [ʃäː(ɦ)˦.mʊ.kʰiː], lit. ' from the Shah's or king's mouth ', Gurmukhi: ਸ਼ਾਹਮੁੱਖ਼ੀ) is the right-to-left abjad-based script developed from the Perso-Arabic alphabet used for the Punjabi language varieties, predominantly in Punjab, Pakistan.
Benzynes undergo [2+2] cycloaddition with a wide range of alkenes. Due to electrophilic nature of benzyne, alkenes bearing electron-donating substituents work best for this reaction. [30] Due to significant byproduct formation, aryne [2+2] chemistry is rarely utilized in natural product total synthesis. [14] Nevertheless, several examples do exist.